LG Dryer Error Codes & Troubleshooting Guide

Q: What an LG Dryer Error Code Can Tell You

An LG dryer error code is a diagnostic message generated by the dryer’s electronic control system when it detects an operating condition outside the expected range. Depending on the model and code, the message may point to a problem involving: Heating Airflow Temperature sensing Moisture sensing Motor operation Drum rotation Power supply Door or safety circuits Wiring or electronic communication Main control components An error code is useful because it helps narrow the troubleshooting process to a particular system or condition. However, the code does not always identify the exact failed part. What the Code Actually Identifies In many cases, an error code identifies a system, circuit, sensor reading, or operating condition rather than a specific defective component. For example, a temperature-related code may be caused by: A defective thermistor A loose electrical connection Damaged wiring Restricted airflow Excessive heat buildup A control board problem A condition that caused the sensor reading to move outside the expected range The code tells you where to begin troubleshooting, but further diagnosis may be required to determine the actual cause. Symptoms Still Matter Pay attention to what the dryer was doing immediately before the code appeared. Useful observations include: Did the drum turn? Did the dryer produce heat? Did it overheat? Did the cycle stop unexpectedly? Did the code appear immediately after pressing Start? Did it appear during heating? Did it appear only on certain cycles? Did the dryer run for a few minutes before stopping? Was airflow from the exhaust weak? Was the dryer unusually noisy? These symptoms can help distinguish between several possible causes that may produce the same error code. Key Point An LG dryer error code is best used as a diagnostic starting point, not as automatic proof that one particular component has failed.

Q: An Error Code Does Not Always Mean a Part Has Failed

Seeing an error code on an LG dryer does not automatically mean that a component needs to be replaced. Many dryer fault codes can also be triggered by conditions outside the failed part itself. Possible causes may include: Loose connectors Damaged wiring Temporary power interruption Low or incorrect supply voltage Restricted dryer vent Blocked lint filter Improper installation High exhaust temperature Abnormal sensor readings Communication interruptions between electronic components For this reason, replacing a part solely because its system is mentioned in the error description can lead to unnecessary repairs. Example: Temperature Sensor Error A thermistor-related error may seem to indicate a failed temperature sensor. But the actual cause could also be: A disconnected sensor plug Broken wire in the harness Shorted wiring Poor connection at the control board Excessive heat caused by restricted airflow Incorrect resistance reaching the control board The entire circuit should be evaluated before the sensor is condemned. Example: Heating Problem If the dryer displays a code associated with heating, the problem may involve more than the heating element or burner. Depending on the model, diagnosis may include: Heating element Gas igniter Gas valve system Thermal fuse High-limit thermostat Thermistor Airflow restriction Wiring Relays Main control board The same visible symptom can therefore have several possible causes. Check Simple Conditions First Before replacing components, check basic conditions such as: Lint filter is clean Dryer vent is not blocked Exhaust duct is not crushed Dryer has correct power supply Door closes normally Connections are secure Cycle settings are appropriate These simple checks can sometimes resolve the condition without replacing any parts. Key Point An error code identifies what the control system detected, not necessarily which part must be replaced. Proper diagnosis should confirm the actual cause before any component is changed.

Q: Why LG Dryer Error Codes Can Vary by Model

LG dryer error codes are not always identical across every model. Different dryers can use different: Control boards Heating systems Gas or electric configurations Thermistors Moisture sensors Motors Blower systems Communication modules Wiring layouts Software versions As a result, the same code may have slightly different diagnostic procedures depending on the exact dryer model. Electric and Gas Dryers Can Differ An electric LG dryer typically uses an electric heating element. A gas dryer may instead use: Igniter Gas valve coils Flame detection Burner assembly Gas supply components Even when the displayed symptom is similar, the components involved can be very different. Standard and Smart Models May Differ Some newer LG dryers include: Wi-Fi connectivity ThinQ functions Advanced sensors Additional electronic modules More detailed diagnostic functions Older models may not use the same circuits or software logic. Model-Specific Specifications Matter Electrical values can also vary. Examples include: Sensor resistance Motor winding resistance Voltage supply Connector pin assignments Wire colors Control board locations A specification from one LG dryer should not automatically be applied to another model unless the service information confirms it. Find the Model Number Before performing detailed troubleshooting, locate the dryer’s model number. It is commonly found: Inside the door opening On the door frame On a rating label near the opening On the rear or side identification label Use the complete model number when looking up: Service manuals Parts Wiring diagrams Error-code procedures Key Point Always treat error-code information as model-dependent when detailed electrical testing or component replacement is involved.

Find your LG dryer error code and learn what it means, what may be causing it, and which components or systems may need attention. Explore common heating, airflow, temperature sensor, motor, power, and control system fault codes with practical troubleshooting guidance.

Error Code Lookup

Possible Causes

Code Meanings

Diagnostic Guidance

BROWSE LG ERROR CODES BY APPLIANCE

LG REFRIGERATOR
ERROR CODES

Cooling, defrost, ice maker, sensor & communication fault codes

LG WASHER
ERROR CODES

Drain, spin, water supply, door lock & motor fault codes

LG DRYER
ERROR CODES

Heating, airflow, motor, sensor & control fault codes

LG OVEN & RANGE
ERROR CODES

Temperature, ignition, sensor, door lock & control fault codes

LG DISHWASHER
ERROR CODES

Drain, fill, heating, leak & circulation fault codes

How LG Dryer Error Codes Work
What an LG Dryer Error Code Can Tell You
An Error Code Does Not Always Mean a Part Has Failed
Why LG Dryer Error Codes Can Vary by Model
What to Do When an Error Code Appears
Can You Clear an LG Dryer Error Code?
When an Error Code Requires Professional Diagnosis
Find Your LG Dryer Error Code
Add — Add Water Information Code
AE — Compressor Error
big / bi9 — Steam Fresh Large Load Indicator
d80 — Duct Restriction Error
d85 — Duct Restriction Error
d90 — Duct Restriction Error
d95 — Duct Restriction Error
dE — Door Not Closed Error
dE2 — Door Not Locked Error
drn — Drain Pump Error
E1 — Steam Module Overheating
E13 — Drain Pump Error
E3 — No Water Supply (for Steam)
E4 — Steam Heating Error
E5 — Steam Pump Error
EE — EEPROM Error
F0 / FO — Filter Not Inserted Error
F1 — Thermistor Error
9A5 — Gas Dryer Not Heating Error
HS — Humidity Sensor Error
IF / 1F — Filter Missing Error
LE1 — Motor Error
LE2 — Drum Motor Low Amperage / Compressor Error
LE3 — Heat Pump Restricted Fan Error
nC — NFC Module Error
nE — Modem Is Abnormal Error
nF — Wi-Fi Is Not Connected to Router (Not an Error)
nP — Power Supply Voltage Error
nU — NFC Module Error
OE — Drain Pump Error
PF — Power Supply Voltage Error
PS — Power Supply Voltage Error
tE1 — Thermistor Error
tE2 — Thermistor Out of Range Error
tE3 — Thermistor Out of Range or Too Hot Error
tE4 — Steam Generator Error
tE5 — Compressor Inlet Thermistor Error
tE6 — Compressor Outlet Thermistor Error
tE7 — Evaporator Inlet Thermistor Error
UP — ThinQ UP Feature Update (Not an Error)

Understanding LG Dryer Error Codes

Modern LG dryers use electronic control boards, temperature sensors, moisture sensors, motors, heating components, airflow monitoring systems, and other electronic and mechanical components to monitor dryer operation.

When the control system detects an abnormal operating condition, it may display an error code or diagnostic message on the control panel. Depending on the model, an LG dryer error code may indicate a problem involving heating, airflow, temperature sensing, drum or motor operation, power supply, door operation, electrical circuits, or communication between electronic components.

An error code can provide an important starting point for troubleshooting, but it should not automatically be interpreted as confirmation that a specific component has failed.

For example, a temperature-related error may be caused by a defective thermistor, but it can also result from damaged wiring, a loose connector, restricted airflow, abnormal heat buildup, or another condition that causes the temperature signal to fall outside the expected range.

Likewise, a dryer that is not heating may have a problem with the heating system, power supply, airflow, wiring, sensors, or electronic controls depending on the model and symptoms.

Understanding what the code represents can help narrow down the system that needs to be checked.

How LG Dryer Error Codes Work

The main control board continuously receives information from sensors, switches, motors, heating components, and other systems throughout the dryer.

Depending on the model, the control system may monitor:

Drum and motor operation
Dryer temperature
Heating system operation
Exhaust airflow
Moisture levels
Door status
Power supply
Thermistor signals
Blower operation
Gas or electric heating components
Communication between electronic modules

When the control receives a signal outside the expected operating range—or does not receive an expected signal—it may store or display an error code.

For example, if a temperature sensor produces a signal outside its expected range, the dryer may display a thermistor-related error. If the control detects an airflow restriction, power supply problem, motor condition, or communication failure, a different diagnostic message may appear.

Some LG dryer display messages are not actual errors. Depending on the model, the display may also show maintenance reminders, operating status messages, Test Mode information, or feature notifications.

This distinction is important because a displayed code does not always mean the dryer requires a replacement part or professional repair.

The exact meaning and diagnostic procedure can also vary between LG dryer models. Gas and electric dryers may use different heating systems, while newer models may include additional sensors, electronic modules, or LG ThinQ functions.

For this reason, troubleshooting should begin with the exact code shown on the display and the complete dryer model number.

What an LG Dryer Error Code Can Tell You

An LG dryer error code is a diagnostic message generated by the dryer’s electronic control system when it detects an operating condition outside the expected range.

Depending on the model and code, the message may point to a problem involving:

Heating
Airflow
Temperature sensing
Moisture sensing
Motor operation
Drum rotation
Power supply
Door or safety circuits
Wiring or electronic communication
Main control components

An error code is useful because it helps narrow the troubleshooting process to a particular system or condition.

However, the code does not always identify the exact failed part.

What the Code Actually Identifies

In many cases, an error code identifies a system, circuit, sensor reading, or operating condition rather than a specific defective component.

For example, a temperature-related code may be caused by:

A defective thermistor
A loose electrical connection
Damaged wiring
Restricted airflow
Excessive heat buildup
A control board problem
A condition that caused the sensor reading to move outside the expected range

The code tells you where to begin troubleshooting, but further diagnosis may be required to determine the actual cause.

Symptoms Still Matter

Pay attention to what the dryer was doing immediately before the code appeared.

Useful observations include:

Did the drum turn?
Did the dryer produce heat?
Did it overheat?
Did the cycle stop unexpectedly?
Did the code appear immediately after pressing Start?
Did it appear during heating?
Did it appear only on certain cycles?
Did the dryer run for a few minutes before stopping?
Was airflow from the exhaust weak?
Was the dryer unusually noisy?

These symptoms can help distinguish between several possible causes that may produce the same error code.

Key Point

An LG dryer error code is best used as a diagnostic starting point, not as automatic proof that one particular component has failed.

An Error Code Does Not Always Mean a Part Has Failed

Seeing an error code on an LG dryer does not automatically mean that a component needs to be replaced.

Many dryer fault codes can also be triggered by conditions outside the failed part itself.

Possible causes may include:

Loose connectors
Damaged wiring
Temporary power interruption
Low or incorrect supply voltage
Restricted dryer vent
Blocked lint filter
Improper installation
High exhaust temperature
Abnormal sensor readings
Communication interruptions between electronic components

For this reason, replacing a part solely because its system is mentioned in the error description can lead to unnecessary repairs.

Example: Temperature Sensor Error

A thermistor-related error may seem to indicate a failed temperature sensor.

But the actual cause could also be:

A disconnected sensor plug
Broken wire in the harness
Shorted wiring
Poor connection at the control board
Excessive heat caused by restricted airflow
Incorrect resistance reaching the control board

The entire circuit should be evaluated before the sensor is condemned.

Example: Heating Problem

If the dryer displays a code associated with heating, the problem may involve more than the heating element or burner.

Depending on the model, diagnosis may include:

Heating element
Gas igniter
Gas valve system
Thermal fuse
High-limit thermostat
Thermistor
Airflow restriction
Wiring
Relays
Main control board

The same visible symptom can therefore have several possible causes.

Check Simple Conditions First

Before replacing components, check basic conditions such as:

Lint filter is clean
Dryer vent is not blocked
Exhaust duct is not crushed
Dryer has correct power supply
Door closes normally
Connections are secure
Cycle settings are appropriate

These simple checks can sometimes resolve the condition without replacing any parts.

Key Point

An error code identifies what the control system detected, not necessarily which part must be replaced.

Proper diagnosis should confirm the actual cause before any component is changed.

Why LG Dryer Error Codes Can Vary by Model

LG dryer error codes are not always identical across every model.

Different dryers can use different:

Control boards
Heating systems
Gas or electric configurations
Thermistors
Moisture sensors
Motors
Blower systems
Communication modules
Wiring layouts
Software versions

As a result, the same code may have slightly different diagnostic procedures depending on the exact dryer model.

Electric and Gas Dryers Can Differ

An electric LG dryer typically uses an electric heating element.

A gas dryer may instead use:

Igniter
Gas valve coils
Flame detection
Burner assembly
Gas supply components

Even when the displayed symptom is similar, the components involved can be very different.

Standard and Smart Models May Differ

Some newer LG dryers include:

Wi-Fi connectivity
ThinQ functions
Advanced sensors
Additional electronic modules
More detailed diagnostic functions

Older models may not use the same circuits or software logic.

Model-Specific Specifications Matter

Electrical values can also vary.

Examples include:

Sensor resistance
Motor winding resistance
Voltage supply
Connector pin assignments
Wire colors
Control board locations

A specification from one LG dryer should not automatically be applied to another model unless the service information confirms it.

Find the Model Number

Before performing detailed troubleshooting, locate the dryer’s model number.

It is commonly found:

Inside the door opening
On the door frame
On a rating label near the opening
On the rear or side identification label

Use the complete model number when looking up:

Service manuals
Parts
Wiring diagrams
Error-code procedures

Key Point

Always treat error-code information as model-dependent when detailed electrical testing or component replacement is involved.

What to Do When an Error Code Appears

When your LG dryer displays an error code, avoid immediately replacing parts.

A structured approach can make diagnosis much easier.

Step 1: Record the Exact Code

Write down or photograph the exact characters shown on the display.

LG codes can look similar, especially characters such as:

tE and tE1
dE and dE1
LE and LE1
Letter O and number 0
Letter S and number 5

The exact code matters.

Step 2: Note When the Code Appeared

Try to remember what the dryer was doing.

For example:

At startup
During heating
During cool down
Near the end of the cycle
After several minutes of operation
After a power interruption
Only on sensor dry
Only on high heat
During Test Mode

The timing can provide useful diagnostic information.

Step 3: Check Basic Conditions

Before accessing internal components, check:

Lint filter
Dryer vent
Exhaust duct
Power supply
Door closure
Cycle settings
Load size
Visible airflow restrictions

For gas dryers, also make sure the gas supply is available if the symptom involves no heat.

Step 4: Restart the Dryer

A temporary electronic condition can sometimes clear after the dryer is restarted.

Turn the dryer off, allow it to stop completely, then restart it.

If appropriate, disconnect power briefly before restoring it.

Do not repeatedly reset the dryer if the same code immediately returns.

Step 5: Look Up the Exact Code

Use the exact code to determine:

What system it relates to
Whether it is actually an error
What basic checks are recommended
Whether professional diagnosis is likely needed

Some display messages are status indicators rather than faults.

Step 6: Avoid Unsafe Disassembly

Do not open the dryer or perform live-voltage tests unless you are qualified to work safely around appliance electrical systems.

Dryers may contain:

120V circuits
240V circuits
High-current heating circuits
Gas components
Hot internal surfaces
Moving parts

Key Point

Record the code, observe the symptoms, check simple causes first, and then follow troubleshooting information for the exact LG dryer model.

Can You Clear an LG Dryer Error Code?

Some LG dryer error codes may disappear after the condition that caused them has been corrected.

However, clearing the display is not the same as fixing the problem.

If the underlying fault remains, the code will usually return.

Basic Reset

A basic reset may sometimes clear a temporary electronic condition.

A general approach is:

Turn the dryer off.
Disconnect power.
Wait briefly.
Restore power.
Start the dryer again.

The exact reset procedure may vary by model.

When a Reset Can Help

A reset may be useful after:

Temporary power interruption
Brief communication issue
Cycle interruption
Corrected installation problem
Corrected airflow problem
Connector repair
Component replacement

When a Reset Will Not Fix the Problem

A reset will not repair:

Failed heating element
Failed thermistor
Broken wiring
Defective motor
Blocked vent
Failed thermal fuse
Damaged control board
Gas ignition problem
Faulty sensor
Mechanical restriction

If the code immediately returns, further troubleshooting is needed.

Do Not Repeatedly Reset an Active Fault

Repeatedly clearing a code without correcting the cause can make diagnosis more difficult.

It can also allow a condition involving overheating, restricted airflow, or electrical problems to continue.

Some Messages Are Not Errors

LG dryers can display messages that indicate:

Normal operating status
Feature activation
Test Mode information
Maintenance reminder
Connectivity status

These messages may not require any reset at all.

Key Point

Reset the dryer only as a preliminary step. If the same code returns, diagnose and correct the underlying cause rather than repeatedly clearing the display.

When an Error Code Requires Professional Diagnosis

Some LG dryer error codes can be resolved with simple checks.

Others require electrical testing, internal access, or model-specific diagnostic procedures.

Professional diagnosis is especially appropriate when the error involves:

Heating circuit
Thermistor circuit
Motor system
Main control board
Communication circuit
Internal wiring
240V power supply
Gas ignition system
Repeated overheating
Safety devices
Internal airflow components

Electrical Testing May Be Required

Technicians may need to perform tests such as:

Resistance measurements
Continuity checks
Voltage measurements
Wiring-harness inspection
Sensor signal testing
Control-board output testing
Motor winding testing

These procedures require both technical knowledge and safe access to internal dryer components.

Gas Dryers Require Additional Caution

Gas dryers may involve:

Gas valve assembly
Igniter
Burner
Flame sensor
Gas supply
Combustion system

Gas-related diagnosis should be handled carefully because incorrect repair can create safety risks.

High-Voltage Circuits

Electric dryers often use 240V supply power for heating.

Testing live circuits inside the dryer can be dangerous.

If the diagnosis requires energized voltage testing, professional service is recommended.

When to Stop DIY Troubleshooting

Contact a technician if:

Code repeatedly returns
Dryer stops heating
Dryer overheats
Breaker trips
Burning smell is present
Dryer makes unusual mechanical noise
Drum does not turn
Wiring appears damaged
Internal access is required
You are unsure which component the code refers to

Key Point

Basic external checks are appropriate for many conditions, but electrical, heating, gas, and control-system faults often require professional diagnosis.

Find Your LG Dryer Error Code

Use the list below to find the exact code shown on your LG dryer display.

Each code section explains:

What the code means
Whether it is an actual error or a status message
Common causes
What you can safely check
Which components or circuits may need diagnosis
When professional repair may be necessary

Match the Code Exactly

Pay close attention to every character.

For example:

tE, tE1, and tE2 may refer to different temperature-related conditions.

Likewise, similar-looking letters and numbers can represent different codes.

Do not assume two similar codes have the same meaning.

Use the Exact Model When Possible

Before performing advanced troubleshooting, confirm the complete model number of the dryer.

Some diagnostic procedures can vary depending on:

Gas vs. electric dryer
Model year
Control board version
Sensor configuration
Heating system
Wiring layout

Start With the Simplest Checks

For many codes, begin with safe external checks such as:

Cleaning lint filter
Inspecting exhaust vent
Checking power supply
Verifying door closure
Restarting dryer
Checking load conditions

Move to internal testing only when needed.

Do Not Replace Parts Based on the Code Alone

Use the error code as a starting point for diagnosis.

Confirm the failed component through inspection and testing before replacing parts.

Need Professional LG Dryer Repair?

If your LG dryer continues to display an error code, does not heat, overheats, stops during the cycle, or will not operate normally, professional diagnosis may be necessary.

Mint Appliance Repair provides professional dryer diagnosis and repair throughout the Denver metro area.

Next, choose the exact error code shown on your dryer to see its meaning and troubleshooting information.

Add — Add Water Information Code

The Add message on an LG dryer indicates an Add Water Information Code.

It appears when the dryer detects a problem with the water supply used for the steam function.

On applicable LG dryers with a steam feeder drawer, the steam system requires water in the reservoir before a steam cycle can operate properly.

According to the diagnostic reference, the steam feeder should be filled with water up to the MAX fill line, and the drawer should be completely closed before the steam cycle is used.

What Does the Add Code Mean?

Add means the dryer needs water for the steam function.

This message is associated with the steam feeder water supply, not with the dryer’s normal drying airflow or heating system.

If the steam feeder is empty, underfilled, or not properly installed, the dryer may display Add when a steam cycle is selected or begins operating.

Is Add an Error Code?

The source labels it as an Add Water Information Code.

In practical terms, it is a service message indicating that the steam function does not have the expected water supply.

It does not automatically mean that a dryer component has failed.

In many cases, the condition can be corrected by:

Filling the steam feeder
Using the correct type of water
Closing the drawer completely
Restarting the steam cycle

Common Causes

The Add message can appear when:

The steam feeder is empty
The water level is below the required amount
The feeder has not been filled to the MAX line
The steam feeder drawer is not completely closed
The dryer is attempting to run a steam cycle without sufficient water

The first step should therefore be checking the steam feeder rather than assuming there is an internal electrical fault.

What You Can Check

1. Check the steam feeder water level.

Remove or inspect the steam feeder and confirm that it contains enough water.

Before a steam cycle is used, the source instructs that the feeder should be filled to the MAX indicator line.

Do not overfill beyond the indicated maximum.

2. Make sure the drawer is completely closed.

The steam feeder drawer must be properly seated and fully closed.

If the drawer is not completely inserted, the dryer may not operate the steam function as expected.

3. Use tap water only.

The source specifically states:

Do not use distilled water in the steam feeder. Use tap water only.

This is an important model-specific instruction and should be followed when using the steam feature.

What to Do If Add Appears After the Cycle Starts

If the Add Water message appears after the steam cycle has already started, the referenced procedure is:

Press PAUSE to temporarily stop the cycle.
Fill the steam feeder with tap water to the MAX fill line.
Turn the dryer off.
Turn it back on.
Select the STEAM cycle again.
Press START / PAUSE to continue or finish the cycle.

This is the primary corrective procedure given by the source.

Why the Steam Feeder Needs Water

The steam feature depends on a dedicated water reservoir to produce steam.

Unlike a standard drying cycle, a steam cycle cannot operate properly if the feeder does not contain enough water.

Therefore, the Add message is essentially telling you:

The dryer needs water before the steam function can continue normally.

Does Add Mean the Dryer Is Not Heating?

No.

Add is specifically related to the steam feeder water supply.

It does not by itself indicate a problem with:

Heating element
Gas burner
Thermal fuse
Thermistor
Blower
Motor
Main control board

If the dryer is also not heating, that symptom should be diagnosed separately.

Does Add Mean the Steam Feeder Is Broken?

Not necessarily.

An empty or improperly filled steam feeder is enough to produce the message.

Before considering any component failure, confirm:

The feeder contains water
Water reaches the MAX line
Tap water is being used
The drawer is fully closed
The steam cycle is restarted after refilling

Only if the Add message continues after these conditions are corrected would further diagnosis be appropriate.

Add Appears Only on Steam Cycles

The Add message is relevant to dryers equipped with a steam function and steam feeder.

If a standard drying cycle operates normally but Add appears only when using Steam, that behavior points toward the steam water supply rather than the main drying system.

This distinction can help avoid unnecessary troubleshooting of heating or airflow components.

Should You Use Distilled Water?

No, according to the referenced LG error-code guidance.

The source specifically instructs users to use:

Tap water only

and not distilled water in the steam feeder.

This should be followed even though distilled water may seem cleaner, because the system is designed to operate with the specified water type.

If the Add Message Returns

If Add continues to appear:

Confirm that the dryer model uses a steam feeder.
Fill the feeder to the MAX line.
Use tap water only.
Make sure the feeder is inserted correctly.
Make sure the drawer is fully closed.
Restart the dryer.
Select the Steam cycle again.
Observe whether Add returns.

If the message continues despite correct filling and installation, further inspection may be necessary.

When to Call a Professional Technician

Professional diagnosis may be appropriate if:

Add returns even with the feeder filled to MAX
The drawer is properly closed but the code remains
The steam function does not operate
The feeder or drawer appears damaged
Water is present but the dryer does not recognize it
Another error code appears together with Add
The dryer requires internal access to the steam system

At that point, diagnosis may need to move beyond basic user-level checks.

Key Point

Add means Add Water Information Code.

It indicates that the dryer’s steam feeder does not have the expected water supply.

The primary solution is to:

Fill the steam feeder with tap water to the MAX line and make sure the drawer is completely closed.

If Add appears during a cycle, pause the dryer, refill the feeder, power the unit off and back on, select the Steam cycle again, and press Start/Pause.

Most Add messages should be treated as a steam water supply condition first, not as evidence of a failed dryer component.

AE — Compressor Error

The AE error code on an LG dryer indicates a Compressor Error.

This code applies to LG dryer models that use a heat-pump drying system with a compressor.

According to the diagnostic reference, the primary condition associated with AE is:

Compressor failure

The recommended diagnostic procedure is to check the compressor supply voltage and compressor winding resistance. Depending on the results, the repair may require a compressor or Main PCB.

What Does the AE Error Code Mean?

A heat-pump dryer uses a refrigeration-style system to transfer heat and remove moisture from clothing.

The compressor is a central component of that system.

If the dryer detects a compressor-related operating problem, it may display the AE error code.

Unlike a conventional electric dryer that primarily relies on a resistance heating element, a heat-pump dryer uses components such as the:

Compressor
Condenser
Evaporator
Refrigerant circuit
Temperature sensors
Electronic controls

Therefore, AE should be diagnosed as a heat-pump compressor system error on applicable models.

Common Cause

The source identifies the cause of AE as:

Compressor failure.

However, diagnosis should still verify the compressor electrically before replacing it.

The source specifically instructs technicians to check:

Compressor voltage
Compressor winding values

It also notes that repair may require a new compressor or Main PCB.

What You Can Check

1. Confirm that the dryer is a heat-pump model.

The AE information on the referenced page concerns dryers that use a compressor.

Check the complete model number before applying compressor-specific diagnostic information.

2. Power-cycle the dryer.

Turn the dryer off and disconnect power briefly.

Restore power and observe whether AE returns.

If the code repeatedly returns, do not assume that resetting the dryer has corrected the underlying problem.

3. Observe the drying symptoms.

A compressor-related problem may affect the dryer’s ability to operate its heat-pump drying system normally.

Record whether:

AE appears immediately
AE appears after the dryer has been running
The drum still rotates
Clothes remain wet
Drying takes unusually long
The heat-pump system appears not to operate

These observations can help during professional diagnosis.

4. Check the compressor electrically.

The source instructs technicians to check compressor voltage and winding resistance.

These are internal electrical tests and should be performed using the specifications for the exact dryer model.

AE Does Not Have One Universal Resistance Specification

This is particularly important for this code.

The source provides two different compressor examples, demonstrating why the dryer model must be identified before testing.

The examples use different compressor designs and different supply voltages.

Example 1: 240V Inverter BLDC Compressor

The first example is a heat-pump dryer using a:

240V inverter BLDC compressor

The source gives the following winding resistance specifications:

Blue ↔ Red: 2.56 ± 0.3 Ω
Red ↔ Black: 2.56 ± 0.3 Ω
Black ↔ Blue: 2.56 ± 0.3 Ω

A three-phase compressor should have comparable winding resistance between each specified pair.

These values are an example and should not automatically be applied to every LG heat-pump dryer.

Always use the service specifications for the exact model.

Example 2: 120VAC Reciprocating Compressor

The source also provides an example of a heat-pump dryer using a:

120VAC reciprocating compressor

For this example, the listed resistance values are:

Yellow ↔ Blue: 1.21 Ω ±7%
Yellow ↔ White: 5.04 Ω ±7%

The compressor supply is specified as:

120VAC.

These values are clearly different from those of the 240V inverter BLDC compressor.

This is why compressor testing must be model-specific.

Example: LG DLHX4072

The diagnostic reference specifically identifies the wiring diagram shown for the 120VAC compressor example as coming from model:

LG DLHX4072.

Therefore, the wiring arrangement, wire colors, resistance values, and voltage shown in that example should not automatically be assumed to apply to another LG dryer.

Why Compressor Winding Resistance Is Checked

Measuring winding resistance helps determine the electrical condition of the compressor motor.

Depending on compressor design, abnormal measurements may indicate:

Open winding
Shorted winding
Internal compressor electrical failure

However, a compressor should be evaluated using the specifications for its exact design.

The correct reading for one compressor type may be completely incorrect for another.

Why Compressor Voltage Is Checked

A compressor cannot operate normally if it does not receive the required electrical supply.

Therefore, the diagnostic procedure also includes checking compressor voltage.

This helps distinguish between a compressor that is receiving the expected power but cannot operate and a condition where the compressor is not being properly powered.

The source specifically notes that the repair may ultimately involve either the:

Compressor

Main PCB.

The correct component should be identified through testing rather than replaced based solely on the AE code.

Does AE Automatically Mean the Compressor Is Bad?

Not without diagnosis.

The source associates AE with compressor failure, but it also instructs technicians to check the compressor’s voltage and winding values and states that a Main PCB may be required.

Therefore, AE should not be treated as an instruction to immediately replace the compressor.

A better diagnostic sequence is:

Confirm model → identify compressor type → check wiring/connections → check compressor windings → check compressor voltage → determine whether compressor or control-side repair is required

Does AE Apply to Every LG Dryer?

No.

The referenced information specifically concerns heat-pump dryers using a compressor.

Traditional vented LG dryers may use a different heating system and do not necessarily share this compressor-based diagnostic configuration.

Before using the AE diagnostic information, confirm that the model actually contains a heat-pump compressor system.

AE on LG Washer vs. LG Dryer

This distinction is especially important for our Error Codes Knowledge Center.

On an LG front-load washer, AE can have a completely different meaning depending on the model.

On the LG dryer reference we’re using here:

AE = Compressor Error

Therefore, error codes should always be interpreted according to the appliance type and exact model, not simply by searching for the letters shown on the display.

If the AE Error Returns

If AE repeatedly returns:

Record the complete LG dryer model number.
Confirm that the dryer uses a heat-pump compressor.
Disconnect power before inspecting internal connectors or wiring.
Identify the compressor type used by the model.
Inspect compressor connections and associated wiring.
Check compressor winding resistance using model-specific specifications.
Check the required compressor supply voltage.
Determine whether the compressor is receiving the expected electrical supply.
Diagnose the Main PCB/control side if the compressor is not being properly powered.
Replace components only after the failed part has been confirmed.

Do not use the 240V BLDC or 120VAC reciprocating compressor values unless they apply to the compressor installed in the specific dryer.

When to Call a Professional Technician

Professional diagnosis is recommended for AE because the troubleshooting procedure involves the heat-pump compressor and live electrical measurements.

Service is especially appropriate if:

AE repeatedly returns
Dryer is not drying properly
Compressor does not operate
Compressor winding resistance needs to be measured
Compressor voltage needs to be tested
Main PCB output needs diagnosis
Internal heat-pump components need to be accessed

Live-voltage testing inside a dryer can be hazardous and should only be performed by someone qualified to work on appliance electrical systems.

Key Point

AE means Compressor Error on the referenced LG dryer system.

The source identifies compressor failure as the cause and instructs technicians to check compressor voltage and winding resistance. Depending on the results, repair may require the compressor or Main PCB.

The source provides two substantially different compressor examples:

240V inverter BLDC compressor: approximately 2.56 ± 0.3 Ω between each specified winding pair.

120VAC reciprocating compressor: 1.21 Ω ±7% and 5.04 Ω ±7% across the specified terminals.

These are model-specific examples, not universal LG dryer specifications. Always identify the exact dryer and compressor type before performing electrical diagnosis.

big / bi9 — Steam Fresh Large Load Indicator (Not an Error)

The big or bi9 message on an LG dryer is not an error code.

It is a Steam Fresh Large Load Indicator used on applicable LG dryers when a large load size is selected for the Steam Fresh cycle.

Because of the way characters appear on a segmented dryer display, big may visually resemble bi9 or b19. The diagnostic reference describes the displayed indication as “bi9” or “big.”

What Does big / bi9 Mean?

big indicates that the large-load setting has been selected for the Steam Fresh cycle.

The Steam Fresh cycle adjusts its cycle time according to the number of items being treated.

The display can show:

1 — 1 item
3 — 2 or 3 items
5 — 4 or 5 items
big — a large load, such as a comforter

Therefore, seeing big on the display does not mean that the dryer has detected a malfunction.

Is big an Error Code?

No.

big is a load-selection indicator associated with the Steam Fresh cycle.

It does not indicate a failure of the:

Heating system
Motor
Thermistor
Moisture sensor
Steam system
Main Control Board
Blower system

If the dryer is otherwise operating normally, no repair is required simply because big appears.

Why Does the Dryer Need a Load-Size Setting?

According to the reference, the duration of the Steam Fresh cycle depends on the number of items in the load.

A single garment does not require the same cycle duration as several garments or a large bulky item.

The load-size selection allows the dryer to adjust the Steam Fresh cycle according to the amount of clothing being treated.

Steam Fresh Load Settings

The reference provides four load-size indications.

1 — One Item

Select this setting when using Steam Fresh for a single item.

3 — Two or Three Items

This setting corresponds to approximately two or three items.

5 — Four or Five Items

This setting is intended for approximately four or five items.

big — Large Load

The big setting indicates a larger load, with a comforter given as an example in the diagnostic reference.

How to Change the Load Setting

The source instructs users to use the:

More Time or Less Time

buttons to change the display so that it reflects the number of items in the load.

The available indications are:

1 → 3 → 5 → big

Select the option that most closely matches the amount of laundry being treated with the Steam Fresh cycle.

Why Does b19 Appear on the Display?

What looks like b19 can be caused by the limitations of the dryer’s segmented digital display.

The intended message is big, and the reference also writes the display representation as bi9.

Therefore, someone searching online may describe the same display as:

LG dryer b19 code
LG dryer bi9 code
LG dryer big code
LG dryer bIg message

These can all refer to the same Steam Fresh large-load indication.

For our Knowledge Center, this makes it useful to include the alternative appearance in the heading so users who read the display as b19 can still find the correct explanation.

Important Steam Cycle Information

The reference also notes that the Steam Sanitary and Steam Fresh cycles are designed for use with dry clothing.

This is important because these cycles are not intended to function like a normal drying cycle for a load of wet laundry.

They are specialized steam functions.

What You Can Check

If big appears:

1. Check which cycle is selected.

Confirm that you are using the Steam Fresh cycle.

2. Check the amount of clothing.

Determine whether the selected load size matches the number of items being treated.

3. Use More Time or Less Time if necessary.

Adjust the load indication to:

1
3
5
big

depending on the load.

4. Remember that Steam Fresh is intended for dry clothing.

If you are trying to dry a normal wet laundry load, select an appropriate drying cycle instead.

Does big Mean the Dryer Is Overloaded?

No.

The word big does not by itself mean that the dryer has detected an overload.

It indicates that the large-load option has been selected for Steam Fresh.

A comforter is specifically given by the source as an example of a load for the big setting.

This is different from an actual motor, drum, or overload fault.

Does big Mean the Steam System Is Broken?

No.

The message does not indicate failure of the steam system.

It is simply part of the Steam Fresh cycle’s load-size selection.

Do not replace steam components, sensors, valves, or electronic controls solely because big appears on the display.

Does big Need to Be Cleared?

No reset is normally required.

Because big is not an error, there is no fault code that needs to be cleared.

If the selected load size is incorrect, use More Time or Less Time to choose the appropriate setting.

The display will then reflect the selected load size.

big vs. Add

Both messages can appear in connection with LG steam dryer functions, but they mean different things.

Add — Add Water Information Code
Indicates that water is needed for the steam function on applicable models.

big / bi9 — Steam Fresh Large Load Indicator
Indicates that the large-load setting is selected for the Steam Fresh cycle.

Therefore:

Add = steam system needs water

big = large Steam Fresh load selected

Neither message should automatically be interpreted as a failed dryer component.

When to Call a Professional Technician

The big indication by itself does not require professional dryer repair.

Service may be appropriate only if there is a separate problem, such as:

Steam Fresh cycle will not operate
Dryer stops unexpectedly
Another actual error code appears
Controls do not respond
Dryer has a separate heating or operating problem

If the dryer operates normally and big appears while using Steam Fresh, the display is functioning as intended.

Key Point

big / bi9 means Steam Fresh Large Load Indicator, and it is not an error code.

The Steam Fresh cycle uses the selected number of items to determine cycle time. The available settings are:

1 = 1 item
3 = 2–3 items
5 = 4–5 items
big = large load, such as a comforter.

Use the More Time or Less Time button to change the load-size setting.

Also remember that LG’s Steam Sanitary and Steam Fresh cycles are designed for dry clothing.

d80 — Duct Restriction Error

The d80 error code on an LG dryer indicates a severe restriction in the dryer’s exhaust airflow.

LG uses a series of duct restriction codes — d80, d85, d90, and d95 — to indicate increasing levels of airflow restriction in the exhaust system.

With d80, the dryer has detected approximately 80% airflow restriction. This means that air is having significant difficulty moving from the dryer through the exhaust duct and outside the home.

What Does the d80 Error Code Mean?

During operation, an LG dryer needs to move a large volume of heated, moisture-filled air through the exhaust system.

If that airflow becomes restricted, heat and moisture cannot leave the dryer efficiently.

The dryer’s Flow Sense system can detect conditions consistent with excessive exhaust restriction and display a duct restriction code.

The progression is:

d80 — approximately 80% restriction
d85 — approximately 85% restriction
d90 — approximately 90% restriction
d95 — approximately 95% restriction

The higher the number, the more severe the detected restriction.

Is d80 an Error Code?

Yes. d80 is a duct restriction warning/error indicating that the dryer has detected severely reduced exhaust airflow.

Unlike many electronic fault codes, d80 usually points first toward the dryer venting system rather than a failed electronic component.

The problem may be located:

Behind the dryer
Inside the exhaust duct
At the exterior vent hood
In a roof vent
In the lint filter
In the dryer’s internal airflow path

The entire airflow path should be considered.

Common Causes of d80

According to the diagnostic reference, common conditions that can trigger d80 include:

Exhaust duct clogged with lint
Kinked or crushed duct
Excessively long duct run
Too many bends or elbows
Restricted outside vent hood
Vent flap that cannot fully open
Screen over the exterior vent that has become clogged
Incorrect flexible duct material
Restricted lint filter
Internal airflow obstruction
Internal gasket problems

An exhaust system that is too long or contains too many turns can create enough resistance to trigger a Flow Sense warning even if the duct is not completely blocked.

First Thing to Check: The Lint Filter

Remove and inspect the lint screen.

Clean off all visible lint before operating the dryer.

However, a filter that looks clean can still restrict airflow.

Fabric softener and dryer sheets can leave a waxy residue on the screen. The source recommends a simple water test: if water beads on the lint screen rather than passing through normally, buildup may be restricting airflow.

In that situation, clean the screen with hot water and a soft brush.

Check the Exhaust Duct Behind the Dryer

Inspect the duct between the dryer and the wall.

Look for:

Sharp bends
Crushed sections
Kinks
Excessive length
Lint accumulation
Poor connections

A dryer pushed too close to the wall can compress the duct and dramatically reduce airflow.

Straighten the duct and provide enough clearance behind the dryer to prevent it from becoming crushed again.

Check the Outside Dryer Vent

Run the dryer and inspect the exterior vent termination.

There should be strong airflow coming from the outside vent while the dryer is operating.

Check whether:

Vent flap opens freely
Lint is blocking the opening
A screen is clogged
Debris is obstructing the vent
Vent hood is damaged
Snow, vegetation, or other material is restricting the outlet

A flap that opens only partially can significantly reduce airflow.

Screens on Dryer Vents Can Cause Problems

The reference specifically discusses screens installed over exterior dryer vents.

These screens can collect lint and eventually restrict airflow.

A screen may initially appear to protect the duct from animals or debris, but accumulated lint can turn it into an airflow obstruction.

The source shows examples of clogged roof vent screens and exterior vent caps associated with restricted airflow.

Check the Type of Dryer Vent

The diagnostic reference distinguishes between several types of duct material.

It identifies:

Rigid duct — recommended

Semi-rigid duct — approved flexible option

and states that vinyl flex vent and foil flex vent are not approved for LG dryers.

The source recommends 4-inch rigid or semi-rigid metal ductwork for proper dryer venting.

Why Flexible Foil Duct Can Trigger d80

Flexible foil duct contains deep corrugations.

Those corrugations create turbulence and additional resistance as exhaust air moves through the duct.

This produces:

Back pressure
Lower airflow volume
Increased drying time
Greater lint accumulation
Conditions that Flow Sense may interpret as vent restriction

The source specifically notes that this reduced airflow can contribute to d80, d85, d90, or d95 messages.

Duct Length and Bends Matter

A dryer vent can be clean and still have excessive airflow resistance if the installation is too long or complicated.

Every bend increases resistance.

The diagnostic reference notes that, for its duct-length calculations, each bend accounts for approximately 10 feet of duct.

For example, a relatively short physical duct containing several bends may behave like a much longer exhaust run.

If the exhaust route is excessively long, the source recommends having it repaired or rerouted.

Check for an Internal Airflow Restriction

If the house vent system has been thoroughly inspected and airflow is still poor, the restriction may be inside the dryer.

The source specifically mentions checking for foreign objects in the airflow system, including objects caught in the blower wheel.

A dryer sheet or other debris trapped near the blower can reduce airflow even when the external vent is clean.

Check Internal Duct Connections

This can be especially relevant after:

New installation
Delivery
Moving the dryer
Previous repair

The source recommends verifying that the heater or vent pipe has not become disconnected inside the dryer, noting that this can occur during shipping or delivery.

Internal Gaskets Can Also Matter

If the vent installation is correct and clean but d80 continues to appear, internal airflow sealing should also be considered.

The diagnostic reference includes internal gaskets among the areas technicians should inspect when troubleshooting persistent duct restriction codes.

Poor sealing can interfere with the expected airflow characteristics and affect Flow Sense detection.

Why d80 Can Cause Long Drying Times

Restricted airflow prevents moisture from being efficiently removed from the drum.

Common symptoms can include:

Clothes taking multiple cycles to dry
Dryer becoming unusually hot
Clothes remaining damp
Weak airflow outside
Dryer shutting down
d80 appearing during operation

The dryer may still produce plenty of heat while drying poorly because the actual problem is airflow rather than heat production.

This is an important diagnostic distinction.

Is It Safe to Keep Using the Dryer With d80?

A severe restriction should not be ignored.

The source explicitly instructs users not to use the appliance until the exhaust system has been cleaned and/or repaired, warning that severely restricted exhaust can create a fire or property-damage risk.

Lint is combustible, and restricted airflow can cause dryer temperatures to rise rapidly.

For that reason, d80 should be treated as more than simply a drying-performance issue.

d80 vs. d85, d90 and d95

These codes belong to the same Flow Sense / duct restriction family.

The primary difference is the severity of the detected restriction.

d80 indicates approximately 80% restriction, while progressively higher codes indicate increasingly severe restriction.

Therefore, if a dryer progresses from d80 to d90 or d95, the exhaust problem should not be interpreted as a new unrelated fault. It indicates that the airflow restriction has become more severe or is being detected at a higher level.

What to Do When d80 Appears

Start with the entire airflow path:

Clean the lint filter.
Check the filter for invisible waxy buildup.
Inspect the duct behind the dryer.
Straighten any kinks or crushed sections.
Check the exterior vent while the dryer is running.
Make sure the outside flap opens completely.
Remove lint or debris from the vent hood.
Have the full exhaust duct professionally cleaned if necessary.
Check whether the vent run is excessively long or has too many bends.
Replace inappropriate vent material with approved metal ducting.
If the house vent is confirmed clear, investigate internal dryer airflow components.

d80 Still Appears After the Vent Was Cleaned

This situation deserves careful diagnosis rather than immediately assuming the dryer is defective.

First confirm that the entire vent path was actually cleaned — not just the short section behind the dryer.

Long runs through walls, ceilings, or roofs can retain restrictions farther downstream.

The source also notes that on some models the d80 notification may continue to appear even after the exhaust system has been thoroughly cleaned. It provides model-specific procedures for disabling persistent duct notifications after the venting has been verified as clean.

Should You Disable the d80 Notification?

The source provides procedures for disabling duct-sensing notifications on certain LG models.

However, the warning should not simply be disabled to hide an actual airflow problem.

The source introduces these procedures specifically for situations where the venting has already been thoroughly cleaned and the d80 notification persists.

Because button combinations differ by model, there is no single universal sequence for every LG dryer.

Verify the exact model and its instructions before changing the duct-sensing setting.

When to Call a Professional Technician

Professional service or dryer-vent cleaning is appropriate when:

d80 repeatedly returns
Exterior airflow remains weak
Vent runs through walls or roof and cannot be fully inspected
Dryer becomes unusually hot
Drying times remain excessive
Exhaust system is excessively long
Internal blower restriction is suspected
Internal ducting or gaskets need inspection
Vent is confirmed clean but Flow Sense continues detecting a restriction

Depending on the cause, you may need either dryer vent service or appliance diagnosis.

Key Point

d80 means Duct Restriction Error and indicates approximately 80% restriction of the dryer’s exhaust airflow.

The most common place to begin is the venting system: clean the lint filter, inspect the duct behind the dryer, verify strong airflow at the exterior vent, check for clogged or restricted vent caps, and make sure the duct installation is appropriate.

Because severe exhaust restriction can cause excessive heat buildup and increase fire risk, do not ignore d80 or simply disable the warning without first confirming that the entire exhaust system is clean and properly installed.

d85 — Duct Restriction Error

The d85 error code on an LG dryer indicates a severe restriction in the dryer’s exhaust system.

The dryer has detected that exhaust airflow is significantly restricted, preventing hot, moisture-filled air from leaving the appliance efficiently.

LG groups d85 with the related d80, d90, and d95 duct restriction codes. These messages are associated with the dryer’s airflow and venting system rather than automatically indicating a failed electronic component.

What Does the d85 Error Code Mean?

The d85 code indicates that the dryer is operating under conditions consistent with a seriously restricted exhaust system.

The source identifies two primary causes:

The exhaust system is too long or has too many turns or restrictions.
The household exhaust system is blocked.

This means the problem is often outside the dryer itself.

The dryer may be functioning correctly but cannot move enough air through the home’s vent system.

Why Exhaust Airflow Is Important

A dryer must continuously move air through the drum.

During a normal drying cycle:

Air enters the dryer → is heated → passes through the clothing → absorbs moisture → moves through the lint filter and blower → exits through the exhaust duct.

When the exhaust system becomes restricted, the dryer cannot remove heat and moisture efficiently.

This can result in:

Longer drying times
Clothes remaining damp
Excessive dryer temperatures
Weak airflow at the exterior vent
Repeated duct restriction codes
Thermal protection devices activating

More importantly, excessive heat combined with accumulated lint can create a safety hazard.

Is It Safe to Continue Using the Dryer?

No. A severe vent restriction should be corrected before normal operation continues.

The source specifically states that the appliance should not be used until the exhaust system has been cleaned and/or repaired.

It warns that operating a dryer with severely restricted exhaust can result in fire or other property damage.

For this reason, d85 should not be treated simply as an inconvenience or cleared without investigating the vent system.

Common Causes of d85

The diagnostic reference identifies several conditions that can contribute to d80, d85, d90, and d95, including:

Lint-clogged exhaust duct
Kinked dryer duct
Screen blocking the end of the duct
Exterior vent flap that cannot open completely
Incorrect flexible vent material
Excessively long exhaust run
Too many duct bends
Clogged lint screen
Waxy residue on the lint filter
Blocked exterior or roof vent cap
Internal airflow obstruction
Disconnected internal ducting
Internal gasket problems

The complete airflow path should therefore be inspected rather than checking only the short duct immediately behind the dryer.

Check the Lint Filter First

Remove the lint screen and clean all visible lint.

However, visual inspection alone may not be enough.

Fabric softener and dryer sheets can leave a waxy buildup on the lint screen. The filter may appear clean while still restricting airflow.

The source suggests checking whether water beads on the screen. If it does, airflow may also have difficulty passing through it.

A filter affected by this buildup can be cleaned using hot water and a soft brush.

Inspect the Duct Behind the Dryer

Check the transition duct between the dryer and the wall.

Look for:

Crushed sections
Sharp bends
Kinks
Excessive length
Lint buildup
Poorly installed connections

A common problem occurs when the dryer is pushed too close to the wall and compresses the duct.

Even a relatively small crushed section can significantly reduce airflow.

Check the Exterior Vent While the Dryer Is Running

The source specifically recommends checking the outside dryer vent while the appliance is operating.

There should be strong airflow at the exterior outlet.

If airflow is weak, inspect the vent hood for:

Lint accumulation
Damage
Debris
Blocked screen
Restricted flap

The area around the exterior vent should also be kept clear.

Make Sure the Vent Flap Opens Completely

The exterior vent flap should open freely when the dryer is operating.

A flap that remains partially closed restricts airflow and increases drying time.

The source documents a field example where screws left in an exterior vent cap prevented the flap from opening more than approximately halfway. Once the restriction was corrected, the dryer also required attention to a high-limit thermostat that had repeatedly tripped because of blocked airflow.

This illustrates why even a seemingly minor exterior vent problem can have significant effects on dryer operation.

Check for a Screen on the Exterior Vent

Screens installed over dryer exhaust outlets can collect lint.

As lint accumulates, the screen can gradually block airflow and cause:

Weak drying performance
Long drying times
Clothes not drying completely
Duct restriction warnings

Roof vents can be especially difficult to inspect, and the source specifically notes that roof vent-cap screens can become blocked.

Check the Vent Material

The type of duct material matters.

According to the source:

Rigid vent — preferred

Semi-rigid vent — approved flexible option

Vinyl flex vent — not approved

Foil flex vent — not approved

The source states that rigid and semi-rigid duct are the acceptable venting materials for LG dryers.

Why Foil Flex Vent Can Cause d85

Flexible foil duct has deep corrugations.

These irregular surfaces create turbulence as exhaust air moves through the duct.

That turbulence increases back pressure and reduces the volume of air leaving the dryer.

LG’s Flow Sense algorithm may interpret the reduced airflow as a vent blockage and display one of the duct restriction messages, including d85.

The source recommends 4-inch rigid or semi-rigid metal ductwork for proper airflow.

Excessive Duct Length Can Trigger d85

The vent does not necessarily need to be clogged with lint to cause a restriction code.

A duct system can simply be:

Too long
Poorly routed
Equipped with too many elbows

Each bend increases airflow resistance.

The diagnostic reference notes that each bend is treated as approximately 10 feet of duct when evaluating the effective duct run.

This means a physically short vent containing several turns can behave like a much longer exhaust system.

If the vent is excessively long, the source recommends having it repaired or rerouted.

Static Vent Pressure

For professional diagnosis, the source provides another useful specification.

It asks whether static vent pressure is:

0.6″ W.C. or less

If it is higher, the technician should check for a restriction in the customer’s vent system or a vent-cap problem.

This is more useful for professional diagnosis than normal homeowner troubleshooting because appropriate measuring equipment is required.

What If the House Vent Is Clear?

If the entire external exhaust system has been confirmed clear and d85 continues to appear, internal airflow problems should be investigated.

The source specifically recommends checking for:

Foreign objects inside the dryer
Obstruction at the blower wheel
Disconnected heater or vent pipe
Internal gasket defects
High-limit thermostat operation

A dryer sheet caught in the blower wheel is one example provided by the diagnostic reference.

Check Internal Ducting After Installation or Delivery

A persistent airflow problem on a newly installed dryer does not necessarily mean the home’s vent is clogged.

The source recommends verifying that the heater or vent pipe has not become disconnected inside the dryer, particularly on new installations.

Internal ducting can potentially come loose during shipping or delivery.

High-Limit Thermostat

Restricted airflow can cause internal temperatures to rise excessively.

The source gives the following specification for the high-limit thermostat discussed on this diagnostic page:

Opens at 257°F ± 9°F
Closes at 221°F ± 9°F

These values should be treated as diagnostic information associated with the referenced configuration rather than assumed to apply universally to every LG dryer model.

If a high-limit thermostat is repeatedly opening, the underlying airflow problem should be corrected rather than simply replacing the thermostat.

Why d85 Can Cause Long Drying Times

Restricted airflow can create a situation where the dryer produces heat but still does not dry clothes effectively.

The problem is that moisture cannot leave the dryer quickly enough.

Typical symptoms may include:

Dryer heats normally
Clothes remain damp
Cycles take much longer
Dryer cabinet becomes unusually hot
Exterior airflow is weak
d85 repeatedly appears

This is why a dryer that “heats but doesn’t dry” should always have its airflow system checked.

d85 vs. d80, d90 and d95

These codes belong to the same duct restriction family.

They should not be interpreted as four completely different component failures.

The important point is that all four indicate a serious airflow problem that requires inspection of the exhaust system.

As the restriction becomes more severe, drying performance and operating temperatures can become increasingly problematic.

What to Do When d85 Appears

A practical troubleshooting sequence is:

Stop using the dryer until the severe restriction is investigated.
Clean the lint filter.
Check the lint screen for waxy buildup.
Inspect the transition duct behind the dryer.
Straighten crushed or kinked ductwork.
Verify that approved vent material is being used.
Run the dryer and check airflow at the exterior vent.
Make sure the exterior flap opens completely.
Inspect the exterior or roof vent for lint and debris.
Have the complete exhaust duct professionally cleaned if necessary.
Evaluate the duct length and number of bends.
If the external vent system is confirmed clear, inspect the dryer’s internal airflow path.

Should You Disable the Duct Warning?

The diagnostic reference provides procedures for disabling duct restriction notifications on certain LG dryer models.

However, this should not be used as a way to ignore an actual d85 condition.

The source discusses disabling notifications only after the exhaust venting has been thoroughly cleaned and a persistent notification remains. It also shows that the required button combination varies considerably by model family.

Therefore, do not use a generic button combination without confirming the exact dryer model.

When to Call a Professional Technician

Professional service is recommended when:

d85 returns after the vent has been cleaned
Exterior airflow remains weak
The exhaust runs through walls, ceilings, or the roof
Dryer temperatures seem unusually high
Clothes require multiple cycles to dry
The vent installation is excessively long or complex
Internal airflow restriction is suspected
High-limit thermostat operation needs diagnosis
Internal ducting or gaskets need inspection

Depending on where the restriction is located, the appropriate service may be professional dryer vent cleaning, vent-system correction, or appliance repair.

Key Point

d85 means Duct Restriction Error.

The primary causes identified by the reference are an exhaust system that is too long, has too many turns or restrictions, or is blocked.

Do not continue using the dryer with a severe exhaust restriction. Check the lint filter, duct behind the dryer, exterior vent, vent cap, duct material, total duct length, and number of bends. If the external exhaust system is confirmed clear but d85 continues, the dryer’s internal airflow components may require diagnosis.

d90 — Duct Restriction Error

The d90 error code on an LG dryer indicates a severe restriction in the dryer’s exhaust system.

The dryer has detected airflow conditions consistent with a heavily restricted vent. Hot, moisture-filled air is not moving through the exhaust system as efficiently as it should.

According to the diagnostic reference, the two primary conditions associated with d90 are:

An exhaust system that is too long or has too many turns or restrictions
A blocked household exhaust system

Because restricted dryer airflow can cause excessive heat buildup, d90 should be investigated promptly rather than repeatedly cleared or ignored.

What Does the d90 Error Code Mean?

During a normal drying cycle, heated air passes through the clothing, absorbs moisture, and is moved by the blower through the lint filter and exhaust system.

That air must then travel through the household duct and exit outdoors.

When this path becomes severely restricted, the dryer may detect the abnormal airflow condition and display d90.

The source groups d90 with:

d80
d85
d90
d95

These are duct restriction codes detected by the dryer’s Flow Sense system.

Is d90 a Dryer Component Failure?

Not necessarily.

One of the most important things to understand about d90 is that the dryer itself may be operating normally.

The restriction can be located somewhere in the home’s exhaust system.

Possible locations include:

Transition duct behind the dryer
Duct inside a wall
Long horizontal vent run
Vertical duct leading to the roof
Exterior wall vent
Roof vent cap
Lint screen
Internal dryer airflow path

Therefore, replacing dryer components should not be the first response to a d90 code.

Is It Safe to Use the Dryer With d90?

A severe exhaust restriction should not be ignored.

The diagnostic reference specifically instructs users:

Do not use the appliance until the exhaust system has been cleaned and/or repaired.

It warns that using the dryer with severely restricted exhaust is dangerous and could result in fire or other property damage.

The vent system should therefore be inspected before normal dryer use continues.

Common Causes of d90

Conditions associated with LG duct restriction codes include:

Lint buildup inside the exhaust duct
Kinked duct
Crushed transition duct
Blocked vent screen
Exterior vent flap that cannot fully open
Clogged exterior vent cap
Clogged roof vent
Excessively long duct system
Too many bends
Improper vent material
Restricted lint filter
Waxy residue on the lint screen
Foreign object inside the dryer airflow path
Disconnected internal duct
Internal gasket problems

Because several restrictions can exist at the same time, the entire exhaust path should be evaluated.

Check the Lint Filter

Begin with the lint screen.

Remove all visible lint before operating the dryer.

However, a filter that looks clean can still restrict airflow.

Fabric softener and dryer sheets can leave a waxy residue on the screen. The source recommends checking this by placing water on the lint screen.

If water beads on the surface rather than passing through easily, airflow may also be restricted.

The source recommends cleaning this buildup using:

Hot water
A soft brush

If dryer sheets or fabric softener are regularly used, this type of filter cleaning may need to be performed periodically.

Inspect the Vent Behind the Dryer

Check the transition duct connecting the dryer to the home’s exhaust system.

Look for:

Kinks
Crushed sections
Sharp bends
Excessive length
Lint accumulation
Poor installation

A common problem occurs when the dryer is pushed too close to the wall.

The duct becomes compressed behind the appliance, reducing its internal diameter and limiting airflow.

Straighten or correct any restricted sections before testing the dryer again.

Check Airflow at the Exterior Vent

The source specifically instructs technicians and users to check the outside dryer vent while the appliance is operating and verify that there is strong airflow.

While the dryer is running, inspect the exterior outlet.

The vent flap should open freely and there should be noticeable exhaust airflow.

Weak airflow can indicate a restriction somewhere between the dryer and the outside termination.

Check the Exterior Vent Hood

Inspect the vent hood for:

Lint buildup
Debris
Damage
Restricted flap
Blocked screen
Obstructions around the outlet

The area around the vent hood should also remain clear.

Even if the duct itself has been cleaned, a blocked vent cap can still create enough restriction to trigger d90.

Make Sure the Vent Flap Opens Completely

The exterior flap must be able to open freely when exhaust air reaches it.

A partially restricted flap reduces airflow and increases drying time.

The source provides a field example in which screws from an added vent screen prevented the flap from opening fully. The opening was limited to approximately 50%, creating significant airflow restriction.

This illustrates why the exterior termination should always be included in a d90 inspection.

Check Roof Vent Screens

If the dryer exhaust travels upward and exits through the roof, the roof termination deserves particular attention.

The source specifically notes that roof vent-cap screens can become blocked, along with the duct itself.

These restrictions may be difficult to see from inside the home.

A dryer can therefore have:

Clean lint screen
Clean transition duct
No visible blockage behind the dryer

and still display d90 because the restriction is farther downstream.

Check the Vent Material

The source provides specific guidance regarding dryer duct material.

It identifies:

Rigid vent — Best vent material

Semi-rigid vent — Approved flexible material

while:

Vinyl flex vent — Not approved

Foil flex vent — Not approved.

The reference states that semi-rigid and rigid duct are the acceptable venting materials for LG dryers.

Why Flexible Foil Duct Can Cause d90

Flexible foil duct has deep corrugations along its interior surface.

These corrugations create turbulence and back pressure as exhaust air passes through the duct.

The result is reduced airflow.

The source specifically states that this reduced airflow can be detected by the Flow Sense algorithm as a vent blockage, resulting in:

d80, d85, d90, or d95.

The source recommends 4-inch rigid or semi-rigid metal ductwork for dryer venting.

Duct Length Matters

A dryer vent does not need to be completely clogged to create a severe airflow problem.

The exhaust system may simply be too long.

The source recommends having the exhaust system repaired or rerouted if it is extremely long.

Longer duct runs create greater resistance to airflow and also provide more surface area where lint can accumulate.

Too Many Bends Can Trigger d90

Every bend adds additional airflow resistance.

The diagnostic reference uses an important rule when evaluating duct installations:

Each bend accounts for approximately 10 feet of duct.

For example, a vent may not look particularly long, but several bends between the dryer and the wall can create a much greater effective duct length.

This is why both the actual duct length and the number of turns should be evaluated.

Professional Static Pressure Test

For professional diagnosis, the reference provides another useful measurement.

Static vent pressure should be:

0.6″ W.C. or less

If it exceeds this value, the source recommends checking for a restriction in the customer’s vent or a problem with the vent cap.

This test generally requires appropriate diagnostic equipment and is more suitable for a technician than normal homeowner troubleshooting.

What If the Entire House Vent Is Clear?

If the complete external venting system has been inspected and confirmed clear but d90 remains, the restriction may be inside the dryer.

The source recommends checking several internal conditions.

Check the Blower Wheel

A foreign object can become trapped in the internal airflow system.

The reference gives an example of a dryer sheet caught in the blower wheel.

A blower obstruction can reduce airflow even when the household exhaust duct is perfectly clean.

Check Internal Duct Connections

The source also recommends verifying that the heater or vent pipe has not become disconnected inside the dryer.

This is particularly important with a:

New dryer
Recently delivered dryer
Recently moved appliance

The source notes that internal ducting may potentially become disconnected during shipping or delivery.

Check Internal Gaskets

If no external restriction is found, internal airflow sealing should also be inspected.

The diagnostic reference specifically includes internal gasket defects as part of troubleshooting persistent duct restriction errors.

Damaged or improperly positioned seals can change the airflow characteristics inside the dryer.

High-Limit Thermostat and Restricted Airflow

Restricted exhaust can cause dryer temperatures to rise rapidly.

The source lists the high-limit thermostat specifications for the configuration discussed on the page as:

Opens: 257°F ± 9°F

Closes: 221°F ± 9°F.

These should be treated as model/configuration-specific diagnostic values, not universal specifications for every LG dryer.

If a high-limit thermostat repeatedly opens, the underlying airflow restriction should be corrected rather than simply replacing the thermostat.

Why d90 Can Cause Long Drying Times

A dryer can produce heat normally and still dry clothes poorly.

This happens because drying depends on both:

Heat + Airflow

If airflow is severely restricted, moisture cannot efficiently leave the drum.

Possible symptoms include:

Clothes require multiple cycles
Clothes remain damp
Dryer feels unusually hot
Cycle times increase
Exterior airflow is weak
d90 repeatedly appears

This is why a dryer that heats but does not dry properly should always have its exhaust system inspected.

d90 vs. d80, d85 and d95

These codes belong to the same LG duct restriction / Flow Sense family.

They should not be treated as four unrelated dryer failures.

All four direct troubleshooting toward the exhaust airflow system.

The important practical point with d90 is that it represents a serious restriction condition and should prompt inspection and cleaning of the entire vent path before dryer operation continues.

What to Do When d90 Appears

A good troubleshooting sequence is:

Stop using the dryer until the severe airflow restriction is investigated.
Clean the lint filter.
Check the lint screen for waxy residue.
Inspect the duct directly behind the dryer.
Straighten any kinked or crushed sections.
Check that approved vent material is being used.
Inspect the full exhaust duct for lint buildup.
Run the dryer and check airflow at the exterior vent.
Make sure the exterior flap opens completely.
Inspect wall or roof vent caps for blockage.
Evaluate the total duct length and number of bends.
Have the duct professionally cleaned or rerouted when necessary.
If the house exhaust is confirmed clear, investigate the dryer’s internal airflow system.

d90 Returns After the Vent Was Cleaned

Do not assume that the dryer is defective immediately.

First determine whether the entire vent run was cleaned.

Cleaning only the short transition duct behind the dryer may not remove:

Lint inside walls
Roof-vent restrictions
Blocked exterior caps
Restrictions at bends
Screens covered with lint

If the complete external vent system is verified as clean, internal dryer airflow components can then be investigated.

Can the Duct Restriction Notification Be Disabled?

The source provides procedures for disabling duct-error notifications on certain LG dryer model families.

The required button combination varies by model. For example, different families use combinations involving Timed Dry + Signal, TurboSteam + Less Time, Time Dry + Wrinkle Care, or other controls.

However, this function should not be used simply to hide an active d90 problem.

The source introduces these procedures for situations where the exhaust vent has already been thoroughly cleaned and the notification continues to appear.

Always verify the exact dryer model before using a model-specific procedure.

When to Call a Professional Technician

Professional service or vent cleaning is appropriate when:

d90 repeatedly returns
Exterior airflow is weak
Dryer becomes excessively hot
Clothes take multiple cycles to dry
Exhaust duct runs through walls or the roof
Vent system is unusually long
Multiple bends cannot be eliminated
Internal blower obstruction is suspected
Internal ducting or gaskets require inspection
Vent is confirmed clean but the dryer continues detecting a restriction

Depending on the location of the problem, this may require a dryer vent cleaning specialist, HVAC/vent professional, or appliance repair technician.

Key Point

d90 means Duct Restriction Error.

According to the source, the main causes are an exhaust system that is too long, contains too many turns or restrictions, or is blocked.

The first priority is the airflow path: inspect the lint screen, transition duct, complete household exhaust, exterior or roof vent, vent material, duct length, and bends.

Most importantly, LG’s diagnostic reference says not to use the appliance until a severely restricted exhaust system has been cleaned or repaired, because continued operation can create a fire or property-damage risk.

d95 — Duct Restriction Error

The d95 error code on an LG dryer indicates a severe restriction in the dryer’s exhaust system.

The dryer has detected airflow conditions consistent with a seriously restricted venting system. Hot, moisture-filled air cannot move through the dryer and household exhaust system as efficiently as required.

According to the diagnostic reference, the primary causes are:

The exhaust system is too long or has too many turns or restrictions
The household exhaust system is blocked

Because d95 is associated with severely restricted exhaust airflow, the condition should be corrected before normal dryer operation continues.

What Does the d95 Error Code Mean?

A dryer depends on continuous airflow to remove both heat and moisture from clothing.

During normal operation:

Air enters the dryer → passes through the heating system → moves through the drum and clothing → carries moisture through the lint filter and blower → exits through the household exhaust duct.

If the exhaust path becomes severely restricted, the dryer cannot move enough air through this system.

LG’s Flow Sense system can detect conditions associated with restricted exhaust airflow and display one of the related duct restriction messages:

d80
d85
d90
d95

The source specifically states that reduced airflow can be detected by the Flow Sense algorithm as a vent blockage.

Is d95 a Dryer Component Failure?

Not necessarily.

The first place to investigate is usually the dryer exhaust system, not the electronic control board or heating components.

The restriction may be located:

Directly behind the dryer
Inside a wall
Inside a ceiling
In a vertical roof vent
At the exterior vent cap
At the lint filter
Inside the dryer’s airflow system

A dryer can therefore display d95 even when its motor, heater, and electronic controls are functioning normally.

Is It Safe to Continue Using the Dryer?

No. A severe exhaust restriction should be corrected before continued operation.

The source specifically instructs:

“Do not use the appliance until the exhaust system has been cleaned and/or repaired.”

It also warns that operating the dryer with severely restricted exhaust can result in fire or other property damage.

This makes d95 a condition that should be taken seriously rather than repeatedly reset or ignored.

Common Causes of d95

The diagnostic reference identifies several conditions associated with the d80, d85, d90, and d95 family of codes:

Lint-clogged exhaust duct
Kinked duct
Blocked screen at the end of the duct
Exterior vent flap that cannot fully open
Incorrect flexible duct material
Excessively long vent run
Too many duct bends
Restricted lint screen
Waxy buildup from fabric softener or dryer sheets
Blocked exterior vent cap
Clogged roof vent
Internal airflow obstruction
Disconnected internal duct
Internal gasket problems

The complete airflow path should therefore be inspected.

Check the Lint Filter First

Remove the lint screen and clean away all visible lint.

However, a lint filter can restrict airflow even when it appears visually clean.

Fabric softener and dryer sheets may leave a waxy buildup on the screen.

The source recommends a simple test: place water on the lint screen.

If the water beads on the surface instead of passing through normally, the screen may be coated with residue that also limits airflow.

The recommended cleaning method is:

Hot water
Soft brush

If dryer sheets or fabric softener are regularly used, this deeper lint-screen cleaning may need to become part of routine maintenance.

Inspect the Duct Behind the Dryer

Check the transition duct between the dryer and the household vent connection.

Look for:

Kinks
Crushed sections
Sharp bends
Excessive length
Lint accumulation
Poor connections

One common problem occurs when the dryer is pushed too close to the wall.

This can crush or sharply bend the transition duct and significantly reduce the amount of exhaust air that can pass through it.

Check Airflow at the Outside Vent

The source specifically recommends checking the outside dryer vent while the appliance is operating.

There should be strong airflow at the exterior vent.

If airflow is weak, the restriction may be somewhere between the dryer and the exterior termination.

Inspect the vent hood for:

Lint
Debris
Damage
Blocked screen
Restricted flap

Also make sure the area surrounding the vent hood is clear.

Make Sure the Exterior Flap Opens Completely

The exterior vent flap should open freely when the dryer is operating.

If it only opens partially, airflow can be significantly reduced.

The source provides a field example where screws used to attach a screen prevented the exterior vent flap from opening more than approximately halfway.

After that restriction was corrected, the high-limit thermostat also required attention because it had been repeatedly tripped by the blocked airflow.

This demonstrates why the exterior vent termination should not be overlooked.

Check Roof Vent Caps

Dryers that exhaust through the roof can be especially difficult to troubleshoot.

The duct itself may be clean near the dryer while a restriction exists much farther away.

The source specifically notes that roof vent-cap screens can become blocked, as can the duct leading to them.

A professional vent cleaning may be appropriate when the complete duct cannot be safely inspected.

Check the Vent Material

The source distinguishes between acceptable and unacceptable dryer vent materials.

Rigid vent — Best vent material

Semi-rigid vent — Approved flexible material

The source identifies the following as not approved for LG dryers:

Vinyl flex vent

Foil flex vent

It states that semi-rigid and rigid duct are the acceptable venting materials.

Why Flexible Foil Duct Can Cause d95

Flexible foil duct contains deep internal corrugations.

As exhaust air moves across those surfaces, turbulence and back pressure are created.

This reduces airflow volume.

The source specifically explains that the Flow Sense algorithm can detect this reduced airflow as a vent blockage, resulting in a:

d80, d85, d90, or d95

message.

The source recommends 4-inch rigid or semi-rigid metal ductwork for proper venting.

Duct Length Matters

The exhaust system can create excessive airflow resistance even when it is relatively clean.

An extremely long vent run can be enough to cause problems.

The source recommends having an excessively long exhaust system repaired or rerouted.

This is especially important when the dryer is located far from an exterior wall or the vent travels vertically through several levels of a building.

Every Bend Adds Airflow Resistance

The number of turns in the duct is also important.

The source uses the following rule when calculating effective vent length:

Each bend accounts for approximately 10 feet of duct.

This means a physically short exhaust route with several bends may behave like a much longer duct system.

For example, several turns between the dryer and the wall can add substantial effective vent length before the exhaust even enters the main household duct.

Professional Static Pressure Test

For technician-level diagnosis, the source provides a static vent pressure specification:

0.6″ W.C. or less

If static pressure exceeds this value, the diagnostic guidance recommends checking the household vent for restriction or inspecting the vent cap.

This measurement generally requires appropriate equipment and is not necessary for basic homeowner troubleshooting.

What If the Household Vent Is Clear?

If the complete external venting system has been professionally cleaned and verified as clear but d95 remains, the next step is to investigate the dryer itself.

The diagnostic reference identifies several internal possibilities.

Check the Blower Wheel

Foreign material can enter the dryer’s internal airflow path.

The source provides an example of a dryer sheet caught in the blower wheel.

An obstruction at the blower can significantly reduce airflow even when the household exhaust duct is completely clean.

Check Internal Duct Connections

The source recommends verifying that the heater or vent pipe has not become disconnected inside the dryer.

This is particularly relevant for:

Newly installed dryers
Recently delivered dryers
Dryers that have recently been moved

The reference notes that an internal connection may potentially become loose during shipping or delivery.

Check Internal Gaskets

Persistent Flow Sense problems can also require inspection of the dryer’s internal airflow seals.

The source specifically includes internal gasket defects in its diagnostic procedure.

If these seals are damaged or improperly positioned, airflow characteristics inside the appliance may be affected.

High-Limit Thermostat and Restricted Airflow

A severely restricted exhaust system can cause internal dryer temperature to rise rapidly.

The diagnostic reference lists the following high-limit thermostat specifications for the configuration discussed:

Opens at 257°F ± 9°F
Closes at 221°F ± 9°F

These values should be treated as model/configuration-specific, not as universal specifications for every LG dryer.

If the high-limit thermostat repeatedly opens, the underlying airflow restriction must be corrected.

Replacing the thermostat without correcting the vent problem does not address the root cause.

Why d95 Can Cause Long Drying Times

Drying requires both heat and airflow.

A dryer can produce plenty of heat but still leave clothing wet if moisture cannot escape through the exhaust system.

Symptoms associated with severe restriction can include:

Clothes taking multiple cycles to dry
Clothes remaining damp
Dryer becoming unusually hot
Weak exterior airflow
Repeated Flow Sense warnings
Dryer cycling heating components abnormally

This is why venting should be one of the first systems checked when a dryer heats but does not dry effectively.

d95 vs. d80, d85 and d90

All four codes belong to the same LG duct restriction / Flow Sense family.

They should not be treated as four unrelated component failures.

For our troubleshooting purposes:

d80 / d85 / d90 / d95 → investigate exhaust airflow and vent restriction

The source does not define d95 on this page as an exact “95% blockage,” so the safest technical wording is severe duct restriction rather than assigning an exact blockage percentage.

What to Do When d95 Appears

A practical troubleshooting sequence is:

Stop normal dryer use until the severe restriction is investigated.
Clean the lint filter.
Check the lint screen for waxy buildup.
Inspect the transition duct behind the dryer.
Straighten any crushed or kinked sections.
Confirm that appropriate vent material is installed.
Inspect or clean the complete household exhaust duct.
Check airflow at the exterior vent while the dryer is operating for diagnostic purposes.
Make sure the exterior flap opens freely.
Inspect exterior or roof vent caps for lint and debris.
Evaluate total duct length.
Count bends and unnecessary turns.
Have an excessively long or poorly routed vent corrected.
If the household vent is confirmed clear, investigate internal dryer airflow components.

d95 Returns After Professional Vent Cleaning

If d95 returns after cleaning, do not immediately assume that the Main Control Board or another electronic component has failed.

First verify that the entire exhaust system was actually cleaned.

The restriction may remain at:

Exterior vent cap
Roof vent
Screen
Hidden elbow
Long vertical duct
Transition duct behind the dryer

Once the complete household exhaust system has been confirmed clear and properly installed, internal dryer airflow components can be investigated.

Can the Duct Restriction Warning Be Disabled?

On certain LG dryer models, the diagnostic reference provides procedures for disabling duct-error notifications.

However, these procedures are intended for situations where the venting has already been thoroughly cleaned and a notification continues to appear.

The button combination varies by model family.

For example, the source lists different combinations involving controls such as:

Timed Dry + Signal
TurboSteam + Less Time
Time Dry + Wrinkle Care
Less Time + Energy Saver
Wrinkle Care + Energy Saver
Steam + Energy Saver

Do not use a generic procedure without verifying the exact dryer model.

More importantly, do not disable duct sensing simply to hide an active airflow problem.

When to Call a Professional Technician

Professional vent service or appliance diagnosis is recommended when:

d95 repeatedly returns
Exterior airflow is weak
Dryer becomes excessively hot
Clothes require multiple cycles to dry
Vent runs through walls, ceilings, or the roof
Vent system is excessively long
Multiple bends cannot be corrected
Household exhaust has already been cleaned
Internal blower obstruction is suspected
Internal ducting or gaskets require inspection
Flow Sense continues detecting a restriction after the vent system has been verified

Depending on the location of the problem, the appropriate service may be professional dryer vent cleaning, vent-system repair, or appliance repair.

Key Point

d95 means Duct Restriction Error.

The source identifies the primary causes as an exhaust system that is too long, has too many turns or restrictions, or is blocked.

Start by checking the lint filter, transition duct, complete household exhaust system, exterior or roof vent, vent material, duct length, and number of bends.

If the entire external vent system is confirmed clear but d95 continues, inspect the dryer’s internal airflow path, blower, duct connections, gaskets, and related components.

Most importantly, do not continue normal operation with a severely restricted exhaust system. The source specifically warns that doing so can create a fire or property-damage risk.

dE — Door Not Closed Error

The dE error code on an LG dryer indicates a Door Not Closed Error.

The dryer’s control system is not detecting the expected closed-door condition. According to the diagnostic reference, the primary cause is:

Door switch not closed.

The door switch is an important safety component because the dryer must confirm that the door is closed before normal operation can begin.

What Does the dE Error Code Mean?

When the dryer door closes, the door mechanism activates a switch that tells the electronic control system that the door is safely closed.

If the expected signal is not detected, the dryer may display dE.

The problem may be as simple as the door not being completely closed, but if the door is physically closed and dE remains, the door switch circuit should be checked.

The source specifically directs diagnosis toward the door switch rather than the heating, motor, airflow, or temperature-sensing systems.

Common Causes of dE

Possible conditions to investigate include:

Dryer door is not completely closed
Something is preventing the door from closing normally
Door is not properly engaging the switch
Door switch is defective
Door-switch circuit does not show continuity when the door is closed

The referenced diagnostic procedure specifically identifies a defective door switch when the required continuity is absent with the door closed.

What You Can Check First

Before performing any electrical testing, start with the simple mechanical checks.

1. Open and close the dryer door again.

Open the door completely and close it firmly.

Make sure it reaches its normal fully closed position.

2. Check for clothing around the door opening.

Make sure clothing or another object is not caught between the door and cabinet.

Even if the door appears almost closed, improper engagement can prevent the dryer from recognizing the closed-door condition.

3. Inspect the door area.

Look for obvious problems around the:

Door
Latch area
Door opening
Door-switch contact area

If the door does not close normally, address the mechanical problem before assuming that the switch itself has failed.

4. Restart the dryer.

After confirming that the door is completely closed, restart the dryer and check whether dE returns.

If the code immediately reappears with the door properly closed, the door-switch circuit requires further diagnosis.

How the Door Switch Works

The door switch provides the dryer with information about whether the door is open or closed.

When the door is properly closed, the switch should change electrical state and provide the expected signal to the dryer.

If that does not happen, the control cannot reliably confirm that the door is closed.

The dryer may then prevent or interrupt normal operation and display the dE error.

This safety logic helps prevent the dryer from operating normally when the door is open.

Door Switch Continuity Test

The source provides a specific electrical test for the door-switch circuit.

With the door closed, it instructs the technician to check continuity between:

The yellow wire on the white 4-pin connector
The neutral wire

If there is no continuity with the door closed, the source identifies the door switch as defective and recommends replacing it.

Important: This Test Is Model-Specific

The wire color and connector information above comes directly from the referenced diagnostic procedure.

It should not automatically be assumed to apply to every LG dryer model.

LG dryers can use different:

Wiring harnesses
Connector layouts
Door-switch assemblies
Control boards
Wire colors

Before performing electrical testing, confirm the wiring diagram or service information for the exact dryer model.

What Does “No Continuity” Mean?

A continuity test determines whether an electrical path exists through the circuit.

When the dryer door is closed and the switch is functioning correctly, the relevant circuit should reach the expected electrical state.

According to this particular diagnostic procedure:

Door closed + no continuity = defective door switch.

This provides a much stronger basis for replacing the switch than replacing it simply because dE appeared on the display.

Does dE Automatically Mean the Door Switch Is Bad?

Not before basic checks are completed.

First make sure that:

The door is actually closed
Nothing is blocking it
The door closes normally
The switch is being mechanically activated

If those conditions are correct and the switch circuit does not have the required continuity when the door is closed, the source directs repair toward the door switch.

Does dE Mean the Main Control Board Is Bad?

The provided diagnostic page does not identify the Main PCB as the primary cause or recommended repair for this code.

Its troubleshooting procedure is focused specifically on the door switch and its continuity.

Therefore, a Main Control Board should not be replaced simply because the dryer displays dE.

The door condition and door-switch circuit should be checked first.

Does dE Indicate a Heating Problem?

No.

The referenced dE code is specifically:

Door Not Closed Error

It does not by itself indicate failure of the:

Heating element
Gas burner
Thermistor
Thermal fuse
Blower
Motor
Exhaust system

If the dryer also has a heating or airflow problem, that symptom should be diagnosed separately.

Why the Dryer May Not Start With dE

The dryer needs to recognize that its door is closed before normal operation.

If it cannot detect the expected door-switch condition, it may prevent the cycle from starting.

A typical situation may therefore be:

Door appears closed → Start is pressed → dryer does not operate normally → dE appears

In this case, repeatedly pressing Start is unlikely to correct a defective door-switch condition.

dE Appears Intermittently

If dE appears only occasionally, pay attention to how the door behaves.

For example:

Does the code disappear after closing the door again?
Does the door need to be pushed harder than usual?
Does the error appear when the dryer vibrates?
Does the dryer stop after initially starting?

An intermittent problem can still involve the door-switch mechanism or its electrical connection.

Because the provided source gives only the definitive continuity test, further diagnosis beyond that point should use the service information for the exact model.

Can You Clear the dE Error?

If dE was caused simply by an incompletely closed door, properly closing the door may allow normal operation to resume.

You can:

Turn the dryer off.
Open the door.
Check the opening for obstructions.
Close the door completely.
Restart the dryer.

If dE returns even though the door is correctly closed, repeatedly resetting the dryer will not repair a defective door switch.

The switch circuit should be tested.

When the Door Switch Should Be Replaced

The source gives a clear replacement criterion.

With the door closed, perform the specified continuity test.

If the reading shows no continuity, the source states that the door switch is defective and should be replaced.

This makes dE comparatively straightforward compared with codes that can have many unrelated causes.

When to Call a Professional Technician

Professional diagnosis may be appropriate when:

dE remains after the door is fully closed
Dryer will not start
dE repeatedly returns
Door switch requires electrical testing
Door-switch wiring needs inspection
Door switch needs replacement
The door does not properly engage the switch
The exact wiring configuration is unclear

Disconnect the dryer from power before accessing internal wiring or components.

Key Point

dE means Door Not Closed Error.

According to the source, the cause is Door switch not closed. The specified diagnostic procedure is to check continuity from the yellow wire on the white 4-pin connector to neutral with the door closed. If there is no continuity, the source identifies the door switch as defective and recommends replacing it.

For homeowners, start with the simple checks: make sure the door is completely closed and nothing is preventing proper engagement. If dE continues with the door correctly closed, the door-switch circuit should be diagnosed before replacing other dryer components.

dE2 — Door Not Locked Error

The dE2 error code on an LG dryer indicates a Door Not Locked Error.

The dryer’s Main Control Board is not detecting that the Door Lock Switch has successfully closed.

According to the diagnostic reference, the Main Board expects to detect 120VAC on the BLACK wire of the Door Lock Monitor Circuitry after the door-lock mechanism is activated. If this signal is missing, the dryer displays dE2 and the selected cycle will not start.

What Does the dE2 Error Code Mean?

Some newer LG dryers, particularly certain condensing dryers, use a locking system similar to the door-lock system found on LG front-load washers.

Closing the dryer door and electronically locking it are two related but separate events.

The dryer first needs to recognize that the door is closed. After the cycle is selected and Start is pressed, the control activates the door-lock mechanism.

The Main Board then waits for confirmation from the Door Lock Monitor Circuit that the lock has actually engaged.

If that confirmation is not received, the dryer displays:

dE2 — Door Not Locked Error

and prevents the cycle from starting.

Common Causes of dE2

According to the source, the primary conditions to investigate are:

Door not properly closed
Warped or misaligned door
Damaged door strike
Door strike and door lock not properly aligned
Loose connection at the Main Board
Loose connection at the door switch / lock assembly
Defective door switch or lock assembly
Defective Main Board

This means dE2 should not automatically be interpreted as a failed door lock.

The mechanical door alignment and electrical connections should be checked before replacing components.

What You Can Check First

Before performing electrical diagnosis, start with the door itself.

1. Open and close the door again.

Make sure the dryer door closes completely and normally.

Do not force it into position.

2. Check for clothing or other obstructions.

Make sure nothing is trapped between the door and cabinet.

3. Inspect the door alignment.

Look at how the door sits relative to the cabinet opening.

A warped or misaligned door can prevent the strike from properly entering and activating the door-lock mechanism.

4. Inspect the door strike.

The source specifically recommends inspecting the door strike for damage.

If the strike is damaged or incorrectly aligned, the lock may not engage even though the door appears closed.

Door Closed vs. Door Locked

This distinction is important for understanding dE2.

The dryer does not simply need to know:

“Is the door closed?”

It also needs confirmation:

“Did the door-lock mechanism successfully lock?”

On the configuration described by the source, closing the door completes one part of the circuit. When Start is pressed, the Main Board then energizes the door-lock solenoid.

Once the locking mechanism engages, the Door Lock Switch closes and sends the expected electrical signal back to the Main Board.

If that final confirmation is missing, dE2 appears.

How the Door Lock System Works

The source provides a detailed sequence of operation.

Step 1 — Dryer Is Powered On

When the POWER button is pressed, the referenced circuit should have 120VAC between ORANGE (N) and RED (L1).

This establishes the electrical supply used by the door-lock circuit.

Step 2 — Door Is Closed

When the door closes, the interlock switch closes.

The source explains that 120VAC from the RED L1 circuit then travels through the:

Interlock switch → Solenoid → PTC → BLUE wire → Main Board

This satisfies the Door Close Monitor Circuit.

This stage confirms that the door itself has been closed.

Step 3 — Start Is Pressed

After the customer:

Selects a cycle
Selects the desired options
Presses Start

the Main Board sends 120VAC variable-frequency pulses between ORANGE (N) and BLUE (L1).

These pulses are used to activate the door-lock mechanism.

Step 4 — Door Lock Solenoid Activates

The variable-frequency signal energizes the Door Lock Solenoid.

The solenoid mechanically operates the locking mechanism and closes the Door Lock Switch.

At this point, the dryer expects confirmation that the door is now actually locked.

Step 5 — Main Board Confirms the Lock

Once the Door Lock Switch closes, L1 travels through the switch and exits through the BLACK wire.

That signal returns to the Door Lock Monitor Circuit on the Main Board.

The Main Board expects to see 120VAC on the BLACK wire.

If the Main Board detects the expected voltage:

Door locked → Monitor circuit satisfied → Selected cycle begins

If it does not:

Door lock confirmation missing → dE2 displayed → Cycle does not start.

Door Lock Electrical Specifications

The source provides resistance specifications for the dryer door-lock assembly.

The listed meter readings are:

Terminal 2 → Terminal 4:
0.7 kΩ – 1.5 kΩ

Terminal 3 → Terminal 4:
60 Ω – 90 Ω

Terminal 4 → Terminal 5:
Infinite / Open

These measurements can help diagnose the door-lock assembly.

However, they should be treated as specifications for the door-lock configuration described by the source, not automatically applied to every LG dryer.

Door Lock Solenoid

For the configuration shown in the diagnostic reference, the door-lock solenoid operates on 120VAC.

The source describes activation between:

Pin 4 — ORANGE wire

and

Pin 3 — BLACK wire.

Again, this is technician-level information and should be verified against the wiring diagram for the exact dryer model.

Door Switch Circuit

The source also describes the door-switch circuit as making or breaking the L1 side of the circuit between:

Pin 2 — RED wire

and

Pin 1 — BLACK wire.

The interlock switch is closed by the door-lock mechanism when the door is closed.

The door therefore must be correctly closed before the electrical circuit required to operate the door-lock solenoid can be completed.

Wire Colors Can Vary by Model

This is particularly important.

The source explicitly warns technicians to pay attention to the door-lock pin numbers because wiring colors may vary between models.

Therefore, the safest diagnostic approach is:

Use terminal/pin identification + exact model wiring diagram

rather than relying only on wire colors.

Does dE2 Automatically Mean the Door Lock Is Bad?

No.

The source identifies several possible causes besides a defective lock/switch.

Before replacing the door-lock assembly, check:

Door closure
Door alignment
Door strike
Connections at the lock
Connections at the Main Board
Door-lock electrical values
Door Lock Monitor signal

A defective Main Board is also included among the possible causes.

dE vs. dE2

These two codes are related but should not be treated as identical.

dE — Door Not Closed Error

The dryer does not detect the expected closed-door condition.

dE2 — Door Not Locked Error

The dryer does not detect that the Door Lock Switch has successfully locked after the locking sequence begins.

A simple way to understand the difference is:

dE → Is the door closed?

dE2 → Did the door actually lock?

This distinction is important when diagnosing the door system.

Why the Dryer Will Not Start With dE2

This behavior is intentional.

According to the source, if the Main Board does not detect the expected 120VAC on the BLACK Door Lock Monitor wire, it displays dE2 and the cycle will not start.

The dryer is therefore preventing normal operation because it cannot confirm that the required door-lock condition has been achieved.

Can You Clear the dE2 Error?

If the problem was caused by improper door closure or alignment, correcting the condition may allow the dryer to operate normally.

Try:

Turn the dryer off.
Open the door.
Check for obstructions.
Inspect the strike.
Close the door completely.
Make sure the door is properly aligned.
Restart the dryer.
Select the cycle and press Start.

If dE2 returns, repeatedly resetting the dryer will not correct an electrical or mechanical door-lock failure.

Further diagnosis is required.

If dE2 Keeps Returning

A technician should work through the door-lock system rather than replacing parts at random.

A logical diagnostic sequence is:

Door closure → Door alignment → Door strike → Door-lock connections → Main Board connections → Door-lock resistance → Lock activation → Door Lock Monitor signal → Main Board

This helps distinguish a mechanical alignment problem from a failed lock or electronic control problem.

When to Call a Professional Technician

Professional diagnosis is recommended when:

dE2 repeatedly returns
Dryer door closes but does not lock
Dryer will not start
Door strike or lock alignment is uncertain
Door-lock resistance needs to be measured
Door-lock solenoid needs testing
120VAC lock circuit requires diagnosis
Wiring between the lock and Main Board needs inspection
Main Board output or monitor circuit needs testing

The source’s detailed procedure involves 120VAC measurements, so live electrical testing should only be performed by someone qualified to work safely on appliance electrical systems.

Key Point

dE2 means Door Not Locked Error.

The Main Board is not receiving confirmation that the Door Lock Switch has closed. On the configuration described by the source, the Main Board expects 120VAC on the BLACK wire of the Door Lock Monitor Circuit. If that signal is missing, dE2 is displayed and the dryer cycle will not start.

Start with simple mechanical checks:

Close the door properly → inspect alignment → inspect the door strike → check connections.

If the problem remains, the door-lock assembly, its wiring, and the Main Board require electrical diagnosis.

drn — Drain Pump Error

The drn error code on an LG dryer indicates a Drain Pump Error.

This code applies to LG dryer models equipped with a system that collects and drains water during the drying process, such as applicable condenser or heat-pump dryers.

The dryer has detected that the water level is not dropping after the drain pump has operated.

This means the control system expected water to be removed, but the expected decrease in water level did not occur.

What Does the drn Error Code Mean?

Unlike a conventional vented dryer, certain LG dryers produce or collect water as moisture is removed from clothing.

That water must be managed by the dryer’s drainage system.

When drainage is required, the dryer operates its drain system and expects the water level to decrease.

If the water level remains too high after the pump has run, the dryer can display:

drn — Drain Pump Error

The source describes the triggering condition as:

Water level is not dropping after the pump has run.

Is drn Related to the Dryer Vent?

No, not directly.

drn should not be confused with LG’s airflow-related codes such as:

d80
d85
d90
d95

Those codes direct troubleshooting toward the dryer exhaust system.

drn, by contrast, directs troubleshooting toward the water drainage system.

Therefore, cleaning the exhaust duct alone would not normally correct a drn condition.

Common Causes of drn

Based on the diagnostic procedure, the main conditions to investigate are:

Bent drain hose
Folded drain hose
Frozen water inside the drain hose
Drainage system unable to remove water
Damaged control valve
Main PCB problem

The source provides these checks in a specific troubleshooting sequence, so the simple external drain-hose conditions should be checked before considering electronic components.

Check the Drain Hose First

The first troubleshooting step is to inspect the drain hose.

The source specifically instructs:

Check whether the drain hose is bent or folded.

A bent or folded hose can restrict the path through which water needs to leave the dryer.

Inspect the hose from the dryer to its drain connection.

Look for:

Sharp bends
Kinks
Folded sections
Pinched areas
Hose compressed behind the dryer

If the hose is folded, straighten it and restore a clear drainage path.

Make Sure the Dryer Is Not Crushing the Hose

Pay particular attention to the area directly behind the appliance.

If the dryer has recently been:

Installed
Moved
Pushed closer to the wall
Serviced

the drain hose may have become pinched or folded.

A drainage problem that begins immediately after moving or installing the dryer should therefore prompt inspection of the hose before internal components are suspected.

Check for Frozen Water in the Drain Hose

The second condition specifically identified by the source is frozen water remaining inside the drain hose.

If water inside the hose has frozen, the drainage path can become blocked even though the hose itself is not kinked.

The source instructs that frozen remaining water should be melted using 140°F (60°C) warm water.

This is particularly relevant when the dryer or its drainage route is exposed to unusually cold conditions.

Why Frozen Water Can Cause drn

The dryer does not simply check whether the drain pump has been activated.

It expects the drainage process to produce a result: the water level should decrease.

If ice blocks the hose, the system may attempt to drain but water cannot leave normally.

The control then sees that the expected water-level decrease has not occurred and can display drn.

This distinction is useful because the pump may operate while the dryer still reports a drainage problem.

What to Do After Correcting the Drain Hose

After correcting a kink, fold, or frozen-water condition:

Make sure the drain hose has a clear path.
Restore the dryer to normal operating conditions.
Restart the appliance.
Allow the drainage system to operate.
Check whether the drn error returns.

If the water can now drain normally and the code does not return, additional component replacement may not be necessary.

What If the Drain Hose Is Clear?

If the hose is not bent or folded and there is no frozen water, but drn continues to appear, the source moves troubleshooting to the control valve.

It states that if the error remains after the hose checks, the control valve may be damaged.

This is an important diagnostic progression:

Drain hose → Frozen water → Control valve → Main PCB

Components should not be replaced out of sequence without confirming the simpler conditions first.

Control Valve Problem

The diagnostic reference states that if drn remains after the first checks:

The control valve may be damaged.

Its recommended next step is to change the control valve and check whether the drn error remains.

This is a component-level repair and generally requires internal access to the dryer.

Does drn Automatically Mean the Drain Pump Is Bad?

No.

This is particularly important.

Although the source names the condition Drain Pump Error, its troubleshooting procedure does not simply instruct the technician to replace the drain pump.

Instead, it first directs troubleshooting toward:

Bent or folded drain hose
Frozen water in the drain hose
Control valve
Main PCB

Therefore, drn should be interpreted as a drainage-system condition, not automatic proof that the pump itself must be replaced.

Main PCB Diagnosis

If the control valve has been addressed and the drn error still occurs, the final step provided by the source is:

Replace the Main PCB.

The Main PCB controls and monitors dryer operation.

If the drainage components and conditions have been corrected but the control system continues to detect or generate the drainage fault, the board may be responsible.

However, the Main PCB is the last step in the source’s troubleshooting sequence, not the first.

Do Not Replace the Main PCB First

A drn error should not immediately lead to Main PCB replacement.

Before reaching that conclusion, verify:

Drain hose is not bent → Drain hose is not folded → Water is not frozen → Drain path is clear → Control valve has been evaluated

Only after these conditions have been addressed does the referenced procedure direct diagnosis toward the Main PCB.

This approach reduces unnecessary component replacement.

Why Does a Dryer Need a Drain Pump?

This code may seem unusual because traditional vented dryers normally remove moisture primarily as water vapor through the exhaust vent.

However, some modern dryer designs manage condensed water internally.

On applicable models, moisture removed from clothing can become liquid water that must be collected and drained.

If that water cannot leave the machine properly, the dryer needs to detect the condition so that water does not continue accumulating.

The drn code provides that diagnostic indication.

Does drn Apply to Every LG Dryer?

No.

The code is relevant to LG dryer configurations that contain the drainage system associated with this diagnostic procedure.

Traditional vented dryers may use a fundamentally different moisture-removal system.

Therefore, always confirm the complete dryer model number before performing component-level diagnosis.

Model-specific service information should be used for:

Component locations
Wiring
Drainage configuration
Control valve identification
Main PCB diagnosis
Disassembly procedures

drn vs. OE

There is an unusual detail worth understanding.

The supplied source URL contains:

dry_oe-2

but the actual page heading is:

DRY_DRN

and the page describes:

DRAIN PUMP ERROR.

For our LG Dryer Error Codes page, the displayed code should therefore be listed as:

drn — Drain Pump Error

rather than changing it to OE based only on the URL.

The actual page content is more important than the URL slug.

Can You Clear the drn Error?

If drn was caused by a temporary drainage obstruction, correcting the condition may allow the dryer to operate normally again.

A practical sequence is:

Turn the dryer off.
Inspect the drain hose.
Straighten any bent or folded sections.
Correct frozen-water conditions if applicable.
Restore normal drainage.
Restart the dryer.
Observe whether drn returns.

If the code comes back despite a clear drain path, further diagnosis is necessary.

Repeatedly resetting the dryer without correcting the drainage problem will not resolve the underlying condition.

When to Call a Professional Technician

Professional diagnosis is appropriate when:

drn repeatedly returns
Drain hose is clear but water still does not drain
No frozen-water condition is present
Internal drainage components require access
Control valve needs diagnosis or replacement
Main PCB needs evaluation
Water remains inside the dryer
The exact drainage configuration is unclear

If the problem progresses beyond an external hose obstruction, model-specific service procedures should be followed.

Key Point

drn means Drain Pump Error.

The dryer has detected that the water level is not dropping after the pump has operated.

The source’s troubleshooting sequence is straightforward:

1. Check the drain hose for bends or folds.
2. If water in the hose is frozen, thaw it using 140°F (60°C) warm water.
3. If drn remains, the control valve may be damaged and should be evaluated/replaced.
4. If the error remains after the previous steps, the source directs repair toward the Main PCB.

Most importantly, do not interpret “Drain Pump Error” as automatic proof that the drain pump itself has failed. The supplied diagnostic procedure specifically starts with the drain path and proceeds to the control valve and Main PCB.

E1 — Steam Module Overheating

The E1 error code on an LG dryer indicates Steam Module Overheating.

This error is associated with the dryer’s steam system. According to the diagnostic reference, E1 occurs when the water temperature inside the steam system rises above 320°F (160°C).

This is an abnormal high-temperature condition and should not be confused with a normal steam-cycle notification such as Add.

What Does the E1 Error Code Mean?

LG dryers equipped with a steam function use a steam-generation system to produce steam for compatible cycles and features.

During normal operation, the system must keep the water temperature within its intended operating range.

If the dryer detects that the steam-system water temperature has exceeded:

320°F (160°C)

the dryer can display the E1 error code.

In other words:

E1 = the steam module has reached an abnormally high temperature.

Is E1 a Steam System Error?

Yes.

The source specifically identifies E1 as:

Steam Module Overheating

This directs troubleshooting toward the steam-generation system, rather than the dryer’s normal exhaust airflow, drum motor, or primary drying system.

What Causes the E1 Error?

The supplied diagnostic reference does not provide a long list of separate possible causes.

Instead, it defines the fault condition itself:

The water temperature of the steam system has risen above 320°F (160°C).

Therefore, we should not automatically add speculative causes such as a thermistor, control board, wiring harness, or water-supply failure unless those possibilities are confirmed for the specific LG dryer model.

The important diagnostic fact is that the dryer has detected an overtemperature condition in the steam module.

What You Can Check

Because the source directs repair toward the steam generator itself, there are relatively few meaningful homeowner-level checks for E1.

You can:

1. Stop the dryer.

Do not repeatedly restart a steam cycle while an overheating error is occurring.

2. Allow the appliance to cool.

The steam system may contain very hot components and water.

Avoid opening or disassembling the steam-generation system immediately after operation.

3. Record the exact error code.

Confirm that the display actually shows E1.

LG dryers use several different E and temperature-related codes, so the exact characters matter.

4. Confirm the dryer model.

Not every LG dryer uses the same steam-system configuration.

Use the complete model number when identifying parts or service information.

Do Not Confuse E1 With a Normal Steam Message

Some LG dryer messages associated with steam functions are not component failures.

For example, the Add message we covered earlier indicates an Add Water Information Code on applicable models.

E1 is different.

Add → water is required for the steam function

E1 → steam module overheating condition

Therefore, adding water should not automatically be treated as the solution for an E1 error.

Why 320°F (160°C) Matters

The source defines the E1 trigger specifically as steam-system water temperature exceeding:

320°F / 160°C.

That is the diagnostic threshold given for this error.

It should not be interpreted as the normal operating temperature of the dryer drum or exhaust air.

The measurement relates specifically to the steam module condition described by the diagnostic reference.

Does E1 Mean the Dryer Itself Is Overheating?

Not necessarily.

E1 specifically identifies Steam Module Overheating.

It does not by itself establish that the entire dryer, drum, exhaust system, or main heating system is overheating.

For example, E1 should not automatically be diagnosed as:

A clogged dryer vent
A d80/d85/d90/d95 Flow Sense problem
A failed heating element
A blocked lint filter
A motor overheating condition

Those systems have their own symptoms and diagnostic procedures.

The E1 diagnosis should remain focused on the steam system unless additional symptoms or error codes indicate another problem.

Does E1 Automatically Mean the Steam Generator Should Be Replaced?

According to the supplied diagnostic reference, yes—the prescribed repair is replacement of the Steam Generator.

The source’s entire repair instruction is:

Replace Steam Generator.

For our troubleshooting guide, however, it is still useful to confirm the exact dryer model before ordering a component because parts and steam-system designs can vary between models.

Can You Reset the E1 Error?

Power-cycling the dryer may clear the displayed code temporarily, but it does not repair the condition that caused the steam module to overheat.

If E1 returns when the steam system operates, repeatedly resetting the dryer is not an appropriate repair.

The underlying steam-system problem should be corrected.

Should You Continue Using Steam Cycles?

If E1 repeatedly appears, avoid continued use of the steam function until the problem has been diagnosed and repaired.

The code specifically represents an overheating condition.

Continuing to repeatedly activate the steam generator after an overtemperature fault has been detected is not a useful troubleshooting method.

Does E1 Apply to Every LG Dryer?

No.

E1 as described here relates to an LG dryer equipped with the steam-generation system covered by this diagnostic reference.

Some LG dryers:

Do not have steam features
Use different steam configurations
May use different diagnostic logic

Always confirm the complete model number before purchasing or replacing a steam generator.

Professional Diagnosis

E1 is different from codes where the homeowner can usually resolve the condition by cleaning a filter, straightening a hose, or closing the door correctly.

The source provides a component-level repair:

Replace the Steam Generator.

Replacement typically requires:

Disconnecting dryer power
Accessing internal components
Locating the steam generator
Disconnecting its electrical and water connections
Installing the correct replacement component
Reassembling and testing the dryer

For most homeowners, this makes E1 an appropriate code for professional appliance service.

When to Call a Professional Technician

Professional service is recommended if:

E1 repeatedly appears
E1 returns after the dryer has cooled
Steam functions no longer operate correctly
The steam generator requires replacement
Internal steam-system components require access
You are unsure whether the code applies to your exact model

A technician should verify the model-specific steam system before replacing components.

Key Point

E1 means Steam Module Overheating.

According to the LG Error Codes reference, E1 occurs when the water temperature of the steam system rises above 320°F (160°C). The prescribed repair provided by the source is:

Replace Steam Generator.

Unlike Add, which is an informational water-supply message for the steam function, E1 represents an abnormal steam-system temperature condition. If E1 returns, do not repeatedly run the steam function; confirm the dryer model and have the steam generator system properly diagnosed and repaired.

E13 — Drain Pump Error

The E13 error code on an LG dryer indicates a Drain Pump Error.

This code is associated with the water drainage system used on applicable LG dryer models. According to the diagnostic reference, the two primary causes are:

Drain pump failure
Blockage in the drain line

The recommended diagnostic procedure is to first check the drain line for a possible clog and then test the drain pump electrically.

What Does the E13 Error Code Mean?

Certain LG dryers, particularly models that collect condensed water during the drying process, need to remove that water through a drainage system.

The drain pump moves collected water out of the dryer.

If the drainage system cannot operate normally because the drain line is restricted or the pump is not functioning correctly, the dryer may display:

E13 — Drain Pump Error

Unlike the d80, d85, d90, and d95 codes, E13 is not primarily an exhaust-airflow problem. It directs troubleshooting toward the condensate drainage system.

Common Causes of E13

The source identifies two primary causes:

1. Drain line blockage

Water cannot move freely through the drain line.

2. Drain pump failure

The pump itself may not be operating correctly even when the drainage path is clear.

For this reason, the drain line should be checked before assuming that the pump needs replacement.

Check the Drain Line First

The first solution given by the source is:

Check the drain line for a possible clog.

Inspect the drainage path for anything that could prevent water from leaving the dryer normally.

Depending on the installation, check for conditions such as:

Visible obstruction
Restricted drain line
Kinked or pinched hose
Improper routing
Water that cannot flow freely through the drain path

If an obstruction is found, correct it before performing component-level diagnosis.

Why a Blocked Drain Line Can Trigger E13

A functioning pump cannot remove water effectively if its discharge path is blocked.

This is an important distinction because a dryer with E13 does not automatically need a new pump.

The basic diagnostic logic is:

Drain pump attempts to move water → drain path is restricted → water cannot leave normally → drainage fault occurs

Therefore, confirming a clear drain line is the logical first step.

Check the Drain Pump

If the drain line is clear but E13 remains, the next step is to evaluate the drain pump.

The source specifically instructs technicians to check:

Drain pump voltage
Drain pump resistance

These measurements can help determine whether the pump is receiving the expected electrical supply and whether its windings are electrically within the specified range.

Drain Pump Voltage

The diagnostic reference lists the expected voltage to the drain pump as:

220–240 VAC.

This is a high-voltage circuit.

Live voltage testing should therefore not be performed as a normal homeowner troubleshooting step.

A qualified technician can use this measurement to determine whether the dryer is supplying the expected power to the drain pump.

Drain Pump Resistance

The source also specifies:

6–8 Ω on each winding.

This gives technicians a second way to evaluate the electrical condition of the pump.

An abnormal winding measurement can indicate an electrical problem within the pump.

Important: Use Model-Specific Specifications

The 220–240 VAC and 6–8 Ω specifications come directly from the configuration described on the referenced E13 page.

They should not automatically be assumed to apply to every LG dryer that has a drainage system.

Before performing electrical diagnosis, confirm:

Complete dryer model number
Drain pump type
Wiring diagram
Correct connector and terminals
Model-specific service specifications

This is especially important because LG uses different dryer designs in different markets and model families.

Does E13 Automatically Mean the Drain Pump Is Bad?

No.

The source explicitly lists:

Drain pump failure OR blockage in drain line.

Therefore, replacing the pump simply because E13 appears would skip an important diagnostic step.

A better sequence is:

Check drain line → confirm it is clear → inspect pump → measure pump resistance → verify pump supply voltage → determine whether pump repair/replacement is necessary

E13 vs. drn

We have now encountered two LG dryer codes associated with drainage:

drn — Drain Pump Error

and

E13 — Drain Pump Error

They should not automatically be treated as identical diagnostic codes.

For E13, the direct source specifically identifies:

Drain pump failure or blockage in drain line

and provides pump specifications of:

220–240 VAC
6–8 Ω on each winding.

The drn source we covered earlier follows a different troubleshooting sequence involving the drain hose, frozen water, control valve, and Main PCB.

This is a good example of why LG error-code troubleshooting must be model-specific.

Why Different LG Dryers Can Use Different Drain Codes

LG produces several dryer configurations.

Depending on the model and market, a dryer may use different:

Drain pumps
Condensate systems
Sensors
Control boards
Wiring
Diagnostic software

Therefore, two LG dryers experiencing similar drainage problems may display different codes.

Always use the error code together with the complete model number when performing detailed diagnosis.

What You Can Check Safely

Before internal electrical testing:

1. Turn the dryer off.

Disconnect power before inspecting accessible drainage components.

2. Check the drain line.

Look for an obvious restriction or improper routing.

3. Correct any blockage.

Make sure water has a clear path away from the dryer.

4. Restart the dryer.

After correcting the drain condition, observe whether E13 returns.

If the code returns with a clear drain line, pump diagnosis is appropriate.

Can You Reset the E13 Error?

Power-cycling the dryer may clear the displayed code temporarily, but a reset does not remove a clogged drain line or repair a failed pump.

If E13 was caused by a blockage and the blockage has been removed, restarting the dryer may allow normal operation to resume.

If E13 returns, investigate the drainage system rather than repeatedly resetting the appliance.

What If the Pump Has Correct Resistance?

A resistance measurement is only one part of diagnosis.

If the pump windings measure within the specified range for the exact model, the technician may still need to determine whether the pump receives the expected voltage during operation.

The source specifically calls for checking both voltage and resistance, so either measurement alone should not be treated as a complete diagnosis.

What If the Pump Receives 220–240 VAC but Does Not Drain?

If the exact model is confirmed to use the specifications given by the source, the drain path is clear, and the pump receives its expected supply voltage but still cannot move water normally, the pump itself becomes a strong suspect.

Mechanical pump problems are not always revealed by a simple winding-resistance measurement.

Component replacement should still be based on the complete diagnostic result.

What If There Is No Voltage at the Pump?

If the drain pump does not receive the expected supply voltage, replacing the pump immediately may not solve the problem.

Further diagnosis may be necessary to determine why power is not reaching it.

That can involve:

Wiring
Connectors
Control-side operation
Model-specific circuitry

The supplied E13 page does not provide a detailed control-board diagnostic procedure beyond instructing technicians to check pump voltage, so we should not invent a specific failed component at this stage.

When to Call a Professional Technician

Professional diagnosis is recommended when:

E13 returns after the drain line is cleared
Water is not draining
Drain pump operation needs to be tested
Pump resistance needs to be measured
Pump supply voltage needs to be checked
Internal drainage components require access
Wiring or control-side diagnosis is necessary

The source specifies 220–240 VAC at the drain pump for the referenced configuration, making live electrical testing potentially dangerous.

Key Point

E13 means Drain Pump Error.

According to the source, the primary causes are:

Drain pump failure or a blockage in the drain line.

Start by checking the drain line for a clog. If the drainage path is clear, the source instructs technicians to check the drain pump electrically:

Drain pump supply: 220–240 VAC
Drain pump windings: 6–8 Ω each.

Do not replace the pump based on E13 alone. Confirm that the drain path is clear and test the pump using the specifications for the exact LG dryer model before replacing components.

E3 — No Water Supply (for Steam)

The E3 error code on an LG dryer indicates a No Water Supply condition for the steam system.

This error applies to LG dryer models equipped with a steam function that receives water from an external cold-water supply.

The dryer has detected that the steam system is not responding as expected when water should be supplied to the steam generator.

What Does the E3 Error Code Mean?

During steam operation, the dryer supplies water to the steam generator, where the water is heated to produce steam.

The control system monitors the steam generator using a temperature sensor, or thermistor.

According to the diagnostic reference, E3 is detected when the temperature of the Steam Thermistor changes by less than 8°C (46.4°F) from the previous three seconds for 60 seconds.

This condition can indicate that the steam generator is not receiving water normally or that a component responsible for monitoring or controlling the steam system is malfunctioning.

Common Causes of E3

The diagnostic reference identifies six potential causes:

Inlet hose blocked by foreign material
Faulty water inlet valve
Improperly assembled hose between the inlet valve and steam generator
Defective steam-generator thermistor
Defective steam-generator thermostat
Steam generator malfunction

Because several different conditions can produce E3, the code should not automatically be interpreted as a failed steam generator.

The water supply should be checked first.

Check the Cold-Water Supply First

The first diagnostic step is to confirm that the dryer actually has a cold-water source connected.

On applicable steam dryers, a water hose connects the household cold-water supply to the back of the dryer.

The exact connection location can vary by model.

Check that:

The cold-water hose is connected
The household supply valve is open
Water is available at the supply
The hose is not kinked
The hose is not restricted

A closed supply valve or restricted hose can prevent the steam generator from receiving the water it needs.

Check the Water Supply Hose

Inspect the external water-supply hose between the household water connection and the dryer.

Look for:

Sharp bends
Kinks
Pinched sections
Restrictions
Improper installation

This is particularly important if E3 appeared after the dryer was installed, moved, or serviced.

A dryer can have a perfectly functional steam generator and still display E3 if water cannot reach it.

Check the Dryer Water Inlet Valve

If the dryer has an adequate cold-water supply and the external hose is clear, the next component in the diagnostic sequence is the dryer water valve.

The inlet valve controls water entering the steam system.

If the valve does not open correctly, the steam generator may receive little or no water even though the household water supply is functioning normally.

This can produce the same E3 condition as a blocked supply hose.

Check the Hose Between the Valve and Steam Generator

There is another water path inside the dryer:

Water inlet valve → Steam generator

The source specifically instructs technicians to inspect this hose and make sure it is:

Properly connected
Not kinked
Not restricted

This internal connection is important because confirming water at the back of the dryer does not prove that water is actually reaching the steam generator.

Why the Water Path Should Be Checked in Order

A useful diagnostic sequence is:

Household cold-water supply → External inlet hose → Dryer water valve → Internal hose → Steam generator

Checking the system in this order helps avoid replacing electrical components when the actual problem is simply interrupted water flow.

Check the Steam Thermistor

If the water supply and hoses are correct, the diagnostic procedure moves to the steam-generator thermistor.

The thermistor is the temperature sensor used by the control system to monitor conditions in the steam generator.

The source identifies the thermistor at the steam generator as having two blue wires, while specifically noting that the wire colors at the Main PCB can vary by model.

This distinction is important when performing electrical diagnosis.

Thermistor Resistance

The thermistor can be evaluated by measuring its resistance and comparing the reading with the appropriate temperature/resistance specifications.

The source specifically instructs technicians to disconnect the connector from the Main PCB before taking the resistance measurement to obtain an accurate reading.

As a reference example, the source reports a thermistor measurement at approximately:

68°F (20°C): 0.313 MΩ

or approximately:

313 kΩ.

This should be treated as a diagnostic reference for the configuration shown on the source page, not as a universal specification for every LG dryer.

Why a Defective Thermistor Can Cause E3

The control system relies on the thermistor to determine how the temperature inside the steam generator is changing.

Therefore, E3 does not necessarily mean that water is physically absent.

A defective thermistor may provide an incorrect temperature signal even when the steam system is receiving water.

This is why the diagnostic procedure progresses from checking actual water supply to checking the temperature-sensing circuit.

Check the Steam Generator Thermostats

The next diagnostic step is to check the steam generator thermostats.

According to the source:

Both thermostats should be closed at all times.

If a thermostat is open when it should be closed, the steam generator cannot operate according to the expected electrical sequence.

This requires component-level electrical diagnosis.

Does E3 Automatically Mean the Inlet Valve Is Bad?

No.

The inlet valve is only one of several possible causes.

Before replacing it, check:

Cold-water supply → Supply valve → External hose → Inlet valve → Internal hose

If water is reaching the steam generator normally, diagnosis can then move toward the thermistor, thermostats, and steam generator itself.

Does E3 Automatically Mean the Steam Generator Is Bad?

No.

The source places steam-generator replacement at the end of the diagnostic sequence.

Before condemning the steam generator, verify:

Cold-water supply
Inlet hose
Water inlet valve
Hose from valve to steam generator
Steam thermistor
Steam-generator thermostats

Only if these checks are satisfactory and E3 continues does the source identify the steam generator assembly itself as the likely problem.

Steam Generator Failure

If all previous checks are normal but E3 continues to display, the diagnostic reference states that the steam generator assembly may be defective.

Its recommended final repair is:

Replace the steam generator assembly.

The source also provides a heater-resistance check for the steam generator, but the value is presented graphically rather than as accessible text on the page. For that reason, the exact heater resistance should be verified from the service information for the specific dryer model rather than assumed.

E3 vs. E1

Both codes involve the steam system, but they represent very different conditions.

E1 — Steam Module Overheating
The steam system has reached an abnormally high temperature.

E3 — No Water Supply (for Steam)
The dryer is not detecting the expected response associated with water entering and operating within the steam system.

So:

E1 → abnormal steam-system overheating

E3 → steam water-supply / steam-system response problem

This distinction is important when troubleshooting.

E3 vs. Add

The Add message is also related to water and steam operation, but it should not be confused with E3.

Add is an informational message on applicable models indicating that water needs to be added to the steam feeder.

E3 is a diagnostic fault associated with the steam system not receiving or detecting water as expected.

The exact water-delivery design depends on the dryer model.

What You Can Check Safely

Before calling for service, a homeowner can perform several basic checks:

Confirm that the dryer is connected to a cold-water source.
Make sure the water-supply valve is completely open.
Inspect the external inlet hose.
Straighten any kinked or pinched sections.
Make sure water is actually available from the household supply.
Restart the dryer and check whether E3 returns.

If the water supply is normal but E3 continues, internal diagnosis is appropriate.

Can You Clear the E3 Error?

If E3 was caused by a closed water valve, kinked hose, or temporary water-supply interruption, correcting the problem and restarting the dryer may restore normal steam operation.

However, repeatedly resetting the dryer will not correct:

A defective inlet valve
A restricted internal hose
A failed thermistor
An open thermostat
A defective steam generator

If E3 returns after confirming the water supply, further diagnosis is required.

When to Call a Professional Technician

Professional service is recommended when:

E3 repeatedly returns
Cold-water supply is confirmed
External inlet hose is clear
Water inlet valve requires testing
Internal steam-system hose requires inspection
Thermistor resistance needs to be measured
Steam-generator thermostats need testing
Steam generator requires diagnosis or replacement

Internal electrical testing should be performed with the correct wiring diagram and service information for the exact dryer model.

Key Point

E3 means No Water Supply (for Steam).

Start with the simplest part of the system:

Cold-water supply → Inlet hose → Water inlet valve → Hose to steam generator → Thermistor → Thermostats → Steam generator

The source identifies a blocked inlet hose, defective inlet valve, improperly assembled internal hose, defective thermistor, defective thermostat, and steam-generator failure as potential causes. If all preceding checks are normal and E3 remains, the diagnostic procedure directs repair toward replacement of the steam generator assembly.

E4 — Steam Heating Error

The E4 error code on an LG dryer indicates a Steam Heating Error.

This code is associated with the steam-generation system on applicable LG dryer models. It appears when the steam system does not heat quickly enough to reach the temperature expected by the dryer’s control system.

According to the diagnostic reference, E4 occurs when the steam system does not reach 221°F (105°C) within 80 seconds during steam heating.

What Does the E4 Error Code Mean?

When a steam function is activated, the dryer’s steam generator must heat the water to the temperature required for steam operation.

The control system monitors this heating process.

For the configuration described by the diagnostic reference, the dryer expects the steam system to reach:

221°F (105°C)

within:

80 seconds

If that temperature is not reached within the required time, the dryer can display:

E4 — Steam Heating Error

In simple terms:

Steam heating begins → expected temperature is not reached within 80 seconds → E4 is displayed.

What Causes the E4 Error?

The source provides a very focused diagnostic procedure rather than a broad list of possible causes.

It directs technicians to:

Check the wire connection of the Steam Generator.
Replace the Steam Generator if necessary.

This means troubleshooting should initially focus on the steam generator and its electrical connection rather than unrelated dryer systems.

Check the Steam Generator Wiring First

Before replacing the steam generator, inspect its electrical connection.

The source specifically places this step before component replacement.

A poor electrical connection can interfere with the steam generator’s ability to heat normally.

Depending on the model, a technician may need to inspect:

Steam generator connector
Wiring connection
Loose terminals
Disconnected wiring
Damaged wiring in the steam-generator circuit

The exact connector location and wiring configuration should be confirmed using service information for the specific dryer model.

Why the Wiring Should Be Checked Before Replacement

E4 does not automatically prove that the steam generator itself has failed.

The control only knows that the expected heating result did not occur within the required time.

If the steam generator is not properly connected electrically, it may not heat even though the component itself is capable of operating.

Therefore, the diagnostic sequence is important:

Check connection first → evaluate steam generator second.

Steam Generator Failure

If the steam generator wiring connection is correct but the steam system still cannot reach the required temperature, the source directs repair toward:

Replace Steam Generator.

The steam generator is responsible for producing the heat required to generate steam.

If it cannot heat the system to 221°F (105°C) within 80 seconds, the dryer recognizes the abnormal heating condition and generates E4.

Does E4 Mean the Main Dryer Heater Has Failed?

Not necessarily.

E4 specifically refers to steam heating.

It should not automatically be interpreted as failure of the dryer’s primary heating system used to dry clothing.

A dryer may contain separate systems associated with:

Normal drying heat
Steam generation
Temperature monitoring
Airflow

The E4 diagnostic reference specifically directs troubleshooting toward the Steam Generator.

Therefore, replacing the dryer’s normal heating element or another primary heating component solely because E4 appears would not follow the supplied diagnostic procedure.

Is E4 an Airflow Error?

No.

E4 should not be confused with LG dryer airflow codes such as:

Those codes are associated with exhaust duct restriction.

E4 indicates that the steam system is not reaching its required heating temperature within the expected time.

Cleaning the dryer vent may be important for general dryer maintenance, but it is not the repair specified by this E4 diagnostic reference.

E4 vs. E1

Both E1 and E4 involve the steam system, but they describe opposite temperature conditions.

E1 — Steam Module Overheating

The steam system becomes excessively hot. The E1 reference identifies an overtemperature condition above 320°F (160°C).

E4 — Steam Heating Error

The steam system does not heat sufficiently, failing to reach 221°F (105°C) within 80 seconds.

A simple way to distinguish them is:

E1 → Steam temperature too high

E4 → Steam system not heating quickly enough

E4 vs. E3

E3 and E4 can also appear related because both concern steam operation.

However, they point troubleshooting in different directions.

E3 — No Water Supply (for Steam)
Troubleshooting focuses on getting water into the steam system and verifying associated components.

E4 — Steam Heating Error
The steam system does not reach its required temperature within the specified time.

So the basic distinction is:

E3 → Is the steam system receiving water correctly?

E4 → Is the steam generator heating correctly?

Does E4 Automatically Mean the Steam Generator Is Bad?

Not immediately.

The source tells technicians to check the Steam Generator wire connection first.

Therefore, a logical diagnostic sequence is:

E4 displayed → Check Steam Generator wiring/connection → Confirm connection is correct → If the heating fault remains, replace Steam Generator

This avoids replacing the steam generator when the actual problem is simply an electrical connection issue.

What You Can Check First

E4 offers fewer homeowner-level troubleshooting options than a vent, door, or water-supply error because the source directs diagnosis toward an internal electrical component.

However, you can:

1. Stop the dryer and allow it to cool.

Do not repeatedly activate the steam system while the error continues.

2. Confirm the displayed code.

Make sure the dryer actually displays E4.

Similar-looking codes may have completely different meanings.

3. Record the complete model number.

Steam-system designs can vary between LG dryer models.

4. Restart the dryer once.

A power cycle can help determine whether the condition was temporary.

If E4 returns during steam operation, further diagnosis is appropriate.

Can You Clear the E4 Error?

Turning the dryer off and restarting it may temporarily clear the displayed code.

However, resetting the dryer does not repair:

A poor steam-generator electrical connection
A defective steam generator
A steam system that cannot reach its expected temperature

If E4 repeatedly returns, the underlying heating problem should be diagnosed rather than repeatedly resetting the appliance.

Why the 80-Second Heating Window Matters

E4 is not simply a general “steam is not hot enough” message.

The diagnostic reference defines both a temperature target and a time limit:

Target temperature: 221°F (105°C)
Time limit: 80 seconds

This means the control system is evaluating the rate and result of steam heating.

If the required temperature is not reached within that window, the control determines that steam heating is abnormal.

Are 221°F and 80 Seconds Universal for Every LG Dryer?

These values should be treated as specifications for the LG dryer configuration covered by the referenced diagnostic information.

LG dryer designs can vary by:

Model
Production generation
Market
Steam-system design

For component-level diagnosis, always confirm the complete model number and use the appropriate service documentation.

When to Call a Professional Technician

Professional service is recommended when:

E4 repeatedly returns
Steam functions do not operate correctly
The Steam Generator connection needs inspection
Internal wiring requires diagnosis
Steam Generator replacement is necessary
The exact steam-system configuration needs to be identified

Internal electrical components should be inspected with the dryer disconnected from power unless a model-specific diagnostic procedure specifically requires live electrical measurements by a qualified technician.

Key Point

E4 means Steam Heating Error.

The dryer has detected that the steam system did not reach 221°F (105°C) within 80 seconds during steam heating.

The source provides a simple diagnostic sequence:

1. Check the wire connection of the Steam Generator.
2. If the problem remains, replace the Steam Generator.

Do not confuse E4 with an exhaust airflow problem or automatically diagnose the dryer’s primary heating element. The code specifically directs troubleshooting toward the steam heating system.

E5 — Steam Pump Error

The E5 code on an LG dryer indicates a Steam Pump Error.

This code is associated with the steam system on applicable LG dryer models. Unlike many normal operating error codes, E5 is only displayed in Test Mode.

According to the diagnostic reference, the E5 condition occurs when the pump valve value is less than 10 during Test Mode.

What Does the E5 Code Mean?

The steam system uses a pump to move water as part of the steam-generation process.

During Test Mode, the dryer can monitor the operation of this system. If the detected pump valve value is below the expected threshold, the control identifies the condition as:

E5 — Steam Pump Error

The source specifically states:

E5 is only displayed in Test Mode.

This distinction is important because E5 is primarily a diagnostic/service code, rather than an error a customer would normally expect to see during a standard drying cycle.

E5 Detection Condition

The diagnostic reference defines the triggering condition as:

Pump valve value less than 10 in Test Mode

When this condition is detected, E5 is displayed.

The source does not provide additional interpretation of what the numerical pump valve value represents, so it should not be treated as a voltage, resistance, percentage, or water-flow measurement without model-specific service information.

Common Causes to Investigate

The source does not provide a separate “causes” list beyond the Test Mode condition, but its troubleshooting procedure directs diagnosis toward:

Harness wire connection
Electrical connector
Steam pump motor windings
Main PCB output to the steam pump
Steam pump / steam generator assembly

These areas should be evaluated before deciding which component requires replacement.

Check the Wiring and Connector First

The first solution specified by the source is:

Check the connection between the harness wire and connector.

Before condemning the steam pump, inspect the electrical connection associated with the pump circuit.

Look for:

Loose connector
Partially disconnected connector
Damaged terminals
Damaged harness wiring
Poor electrical contact

A connection problem can prevent the pump from operating correctly even when the pump motor itself is functional.

Why the Connection Should Be Checked First

The steam pump requires both a functional electrical path and the correct supply from the control system.

If a connector is loose or the harness circuit is interrupted, the pump may not respond correctly during Test Mode.

Therefore, E5 should not automatically lead to component replacement.

A logical starting point is:

Harness → Connector → Pump → Main PCB output

Check the Steam Pump Motor Resistance

The next diagnostic step is to measure the resistance of the steam pump motor windings.

The source specifies:

Steam pump motor winding resistance: 15–20 Ω.

A resistance measurement outside the specified range can indicate an electrical problem within the pump motor.

Resistance testing should be performed with power disconnected and according to the service procedure for the exact dryer model.

What Does the Resistance Test Tell You?

The resistance test helps determine whether the electrical winding inside the steam pump is intact and within the expected range.

For the configuration covered by the source:

Expected resistance → 15–20 Ω

An open circuit or a substantially abnormal resistance measurement may indicate a defective pump winding.

However, a normal resistance reading does not by itself prove that the entire steam system is operating correctly.

The pump must also receive the proper electrical supply.

Check Voltage From the Main PCB

The source provides another specific diagnostic measurement.

During Test Mode, check whether the Main PCB supplies:

9–12 V DC

to the steam pump.

This measurement helps separate a possible steam-pump problem from a control-side power-supply problem.

Why Both Resistance and Voltage Matter

These two tests answer different diagnostic questions.

15–20 Ω resistance test

Checks the electrical condition of the steam pump motor winding.

9–12 V DC supply test

Checks whether the Main PCB is providing the expected electrical supply to the steam pump during Test Mode.

Therefore, a complete diagnosis should not rely on only one measurement.

If the Pump Measures 15–20 Ω

If the pump motor winding measures within the specified 15–20 Ω range, the next important question is whether the Main PCB supplies the expected voltage when the pump should operate.

The source specifies:

9–12 V DC during Test Mode.

If the expected voltage is present but the pump system still does not operate correctly, further evaluation of the steam pump/steam generator assembly is appropriate.

If the Main PCB Does Not Supply 9–12 V DC

If the pump does not receive the expected voltage during the appropriate Test Mode stage, replacing the steam pump immediately may not solve the problem.

Diagnosis should include the electrical path between the Main PCB and pump, including:

Harness
Connectors
Wiring continuity
Main PCB output

The source specifically instructs technicians to verify whether the Main PCB is supplying 9–12 V DC, but it does not state that every missing-voltage condition automatically requires Main PCB replacement.

Therefore, the circuit should be diagnosed before replacing the control board.

Does E5 Automatically Mean the Steam Pump Is Bad?

No.

E5 identifies a steam-pump-system diagnostic condition, but several checks are required before concluding that the pump itself has failed.

The source’s troubleshooting sequence includes:

Check harness/connector → Check pump resistance → Check Main PCB voltage to pump

This allows a technician to distinguish between:

Connection problem
Pump winding problem
Missing electrical supply
Steam pump / generator assembly problem

Steam Generator Is Replaced as a Complete Assembly

The source provides an important service note:

The Steam Generator is replaced as a complete assembly.

This means that on the dryer configuration described by the reference, service should not automatically be approached as replacement of individual internal steam-generator components.

The correct replacement procedure depends on the exact dryer model and corresponding part configuration.

Is E5 a Normal Customer Error Code?

Generally, no for the configuration described by this source.

The reference specifically states that:

E5 is only displayed in Test Mode.

That makes E5 different from many codes that can appear during normal customer operation.

If E5 is encountered during service diagnostics, the technician should follow the steam-pump testing procedure rather than treating it as a normal cycle notification.

E5 vs. E3

Both codes involve the steam system, but they point toward different conditions.

E3 — No Water Supply (for Steam)
Troubleshooting focuses primarily on getting water into the steam system and checking the related components.

E5 — Steam Pump Error
A Test Mode diagnostic condition directs troubleshooting toward the steam pump circuit, its wiring, winding resistance, and supply from the Main PCB.

In simple terms:

E3 → Is water reaching the steam system properly?

E5 → Is the steam pump circuit operating correctly?

E5 vs. E4

These codes also represent different stages of steam-system operation.

E4 — Steam Heating Error
The steam system fails to reach the expected heating condition.

E5 — Steam Pump Error
The pump-related Test Mode value is below the expected threshold.

Therefore:

E4 → Steam heating

E5 → Steam pump operation

This separation helps narrow down which part of the steam system requires diagnosis.

Model-Specific Diagnosis Is Important

The values provided by the source are:

Steam pump winding: 15–20 Ω

Main PCB output to pump: 9–12 V DC during Test Mode.

These specifications should be treated as applying to the configuration described by the diagnostic reference.

Before testing or replacing components, confirm:

Complete dryer model number
Correct steam-generator assembly
Correct connector
Wiring diagram
Test Mode procedure

LG dryer steam-system designs can vary between models.

When to Call a Professional Technician

E5 is inherently a technician-oriented code because the source states that it appears only during Test Mode.

Diagnosis may require:

Accessing internal components
Inspecting harness connections
Measuring steam pump resistance
Entering the correct Test Mode
Measuring DC voltage during operation
Diagnosing Main PCB output
Replacing the Steam Generator assembly

These procedures are best performed using the service information for the exact dryer model.

Key Point

E5 means Steam Pump Error and, according to the source, is only displayed in Test Mode.

The source provides three primary diagnostic checks:

1. Check the harness wire and connector connection.
2. Check the steam pump motor windings for 15–20 Ω.
3. During Test Mode, check whether the Main PCB supplies 9–12 V DC to the steam pump.

The source also notes that the Steam Generator is replaced as a complete assembly.

EE — EEPROM Error

The EE error code on an LG dryer indicates an EEPROM Error.

EEPROM is a type of non-volatile memory used by the dryer’s electronic control system to store information required for operation.

When the Main PCB cannot properly read from or write to this memory, the dryer may display the EE error code.

What Does the EE Error Code Mean?

Modern LG dryers rely on the Main PCB (Printed Circuit Board) to control and coordinate dryer operation.

The board processes information from multiple systems and uses stored electronic data to manage appliance functions.

The EEPROM is part of this electronic control system.

Unlike temporary memory, EEPROM retains stored information even when power to the appliance is removed.

An EE error indicates that the control has detected a problem involving this memory.

What Is EEPROM?

EEPROM stands for:

Electrically Erasable Programmable Read-Only Memory

It is a type of memory that can retain information without continuous electrical power.

In an appliance control system, EEPROM may be used to retain information needed by the electronic controller.

If the Main PCB cannot reliably access the information stored in EEPROM, normal dryer operation may be disrupted.

What Causes the EE Error?

According to the diagnostic reference, EE is associated with an EEPROM read/write error.

This means the problem is fundamentally associated with the electronic control rather than a normal mechanical condition such as:

Clogged dryer vent
Blocked lint filter
Door not completely closed
Restricted drain hose
Water-supply problem
Steam-generator heating problem

The source directs repair toward the Main PCB.

Is EE a Main Control Board Error?

Yes.

The diagnostic reference specifically identifies the Main PCB as the component associated with the EE fault.

Because EEPROM functionality is part of the electronic control system, an internal memory failure can require replacement of the control board rather than replacement of a separate mechanical dryer component.

Can You Reset the EE Error?

If EE appears, you can try a basic power reset before proceeding with component replacement:

Turn the dryer off.
Disconnect the dryer from power.
Wait several minutes.
Restore power.
Turn the dryer on.
Check whether EE returns.

A temporary electronic condition may disappear after power is restored.

However, if the EE code repeatedly returns, a power reset should not be considered a permanent repair.

An actual EEPROM read/write failure will generally require control-system diagnosis.

Does EE Mean the Main PCB Must Be Replaced?

The repair direction provided by the source is:

Replace the Main PCB.

Therefore, if EE is confirmed and continues to return, the Main PCB becomes the primary component identified by the diagnostic reference.

Before ordering a replacement board, however, always confirm the complete dryer model number.

LG dryers can use different Main PCB assemblies depending on:

Model
Production revision
Electrical configuration
Market
Dryer features

The replacement board must match the specific appliance.

Do Not Replace Unrelated Parts for EE

Because EE is an electronic memory error, replacing unrelated components is unlikely to address the condition unless another model-specific diagnostic procedure identifies an additional problem.

EE should not automatically lead to replacement of:

Heating element
Gas igniter
Thermistor
Blower
Drum motor
Door switch
Drain pump
Steam generator

Those components are associated with other dryer systems and error conditions.

For EE, the supplied diagnostic reference specifically directs attention to the Main PCB.

EE vs. Power Supply Problems

A power interruption and an EEPROM failure are not necessarily the same condition.

Temporary electrical disturbances can sometimes produce unusual electronic behavior, which is why a basic power cycle can be a reasonable initial step.

However, if EE consistently returns after normal power has been restored, the dryer is reporting an internal control-memory problem rather than simply indicating that power was interrupted.

EE vs. PF

These codes should not be confused.

PF — Power Failure

indicates a power-related event or interruption on applicable models.

EE — EEPROM Error

indicates a problem involving the electronic memory used by the Main PCB.

In simple terms:

PF → Power interruption

EE → Control-board memory problem

EE vs. Other Electronic Errors

Not every electronic LG dryer code means the Main PCB itself has failed.

Some codes can be caused by:

Sensors
Wiring
Connectors
Communication between modules
Incorrect power supply
Other electronic components

EE is different because the supplied diagnostic reference specifically identifies an EEPROM error and directs repair toward Main PCB replacement.

That makes the code relatively focused compared with many other dryer errors.

Why the Exact Model Number Matters

A Main PCB should never be selected only from the error code.

Two LG dryers can display the same EE code while using different control boards.

Before replacing the Main PCB, identify the dryer using its complete model and, where applicable, serial or production information.

This helps ensure that the replacement control board is compatible with the appliance.

When to Call a Professional Technician

Professional service is recommended when:

EE returns after a power reset
Dryer will not operate normally
Main PCB requires diagnosis
Main PCB replacement is necessary
Correct replacement board needs to be identified
Additional electronic symptoms are present

Control-board replacement involves internal electrical components, so power should be disconnected before accessing the Main PCB.

Key Point

EE means EEPROM Error.

The dryer’s electronic control has detected a problem involving the EEPROM memory associated with the Main PCB.

The diagnostic reference identifies this as an EEPROM read/write error and directs repair toward:

Replace the Main PCB.

A basic power reset can be attempted first, but if EE repeatedly returns, the problem should be treated as a control-board fault rather than an airflow, heating, drainage, or steam-system issue.

F0 / FO — Filter Not Inserted Error

The F0 (FO) error code on an LG dryer indicates a Filter Not Inserted Error.

This code appears when the dryer does not detect the lint filter in its proper position. According to the diagnostic reference, if the lint filter is left out of the dryer, the F0 (FO) code is displayed and the machine will not start.

The first step is simple: make sure the lint filter is installed correctly.

What Does the F0 / FO Error Code Mean?

LG dryers equipped with this detection system monitor whether the lint filter is installed before allowing the dryer to operate.

If the dryer does not detect the filter, it can display:

F0 (FO) — Filter Not Inserted Error

and prevent the cycle from starting.

This helps prevent the dryer from operating without the lint filter in place.

Check the Lint Filter First

The source’s first troubleshooting instruction is:

Check whether the lint filter is installed and, if it is missing, properly install the filter.

Remove the lint filter and reinstall it carefully.

Make sure that:

The correct lint filter is being used.
The filter is fully inserted.
It sits normally in the filter housing.
Nothing prevents it from reaching its proper position.

After reinstalling the filter, try starting the dryer again.

How Does the Dryer Detect the Lint Filter?

The filter-detection system uses a surprisingly simple mechanism.

According to the source, a magnet embedded in the lint filter activates a reed switch mounted internally in the plastic housing of the vent duct.

The basic operating principle is:

Lint filter inserted → Magnet approaches reed switch → Reed switch activates → Dryer recognizes the filter

If the filter is removed:

Magnet is absent → Reed switch does not activate → Dryer detects missing filter → F0 (FO) appears

What Is a Reed Switch?

A reed switch is an electrically operated switch that can be activated by a magnetic field.

In this LG dryer application, the magnet is incorporated into the lint filter.

When the filter is inserted into its normal position, the magnet approaches the internally mounted reed switch and changes the state of the switch.

The dryer can then use that electrical signal to determine whether the filter is installed.

Why the Dryer May Show F0 / FO Even With the Filter Installed

If the lint filter is physically installed but the error remains, the dryer may not be receiving the expected filter-detection signal.

The source specifically directs technicians to:

Check the lint filter reed switch for continuity.

This means the problem can involve the detection system rather than the physical absence of the filter.

A useful diagnostic distinction is:

Filter missing → Install filter

Filter installed but F0/FO remains → Check filter detection/reed switch

Check That the Filter Is Fully Inserted

A lint filter that is only partially inserted may not position its magnet correctly relative to the reed switch.

Remove the filter and reinstall it completely.

Do not force it into position. If it does not seat normally, inspect the filter area for an obstruction or incorrect positioning.

The goal is to ensure that the magnet in the filter reaches the position required to activate the reed switch.

Check the Correct Lint Filter

Because the detection system depends on a magnet embedded in the lint filter, the correct filter is important.

If the filter has been replaced and the F0/FO code began afterward, verify that the replacement filter is correct for the exact dryer model.

A filter that physically fits the opening does not necessarily guarantee that its detection system is compatible with the dryer.

Reed Switch Continuity Test

If the correct filter is fully installed but the dryer continues to display F0/FO, the source directs diagnosis toward the lint filter reed switch.

The recommended check is:

Check the lint filter reed switch for continuity.

A technician can determine whether the reed switch changes electrical state appropriately when the filter magnet is positioned near it.

If the switch does not respond correctly, the dryer may continue to interpret the lint filter as missing.

Does F0 / FO Mean the Lint Filter Is Clogged?

No.

The source identifies this code specifically as:

Filter Not Inserted Error.

A dirty lint filter can reduce airflow and should always be cleaned regularly, but F0/FO does not specifically mean:

“Lint filter clogged.”

Instead, it means that the dryer does not detect the lint filter as installed.

Is F0 / FO an Airflow Restriction Code?

No.

Do not confuse this code with:

Those codes are associated with exhaust duct restriction.

F0/FO is associated with lint filter presence detection.

Therefore:

d80–d95 → airflow / duct restriction

F0/FO → lint filter not detected

Why the Dryer Will Not Start

According to the source, when the lint filter is left out:

The F0 (FO) error code will display and the machine will not start.

Therefore, a dryer that displays F0/FO and refuses to begin a cycle may actually be operating as designed.

The control is waiting for the required lint-filter detection signal.

Does F0 / FO Automatically Mean the Reed Switch Is Bad?

No.

The simplest explanation is that the lint filter is missing or not properly installed.

Use this troubleshooting sequence:

1. Confirm lint filter is present.
2. Remove and properly reinstall it.
3. Confirm the correct filter is being used.
4. If the code remains, investigate the reed-switch detection system.

The reed switch should not be diagnosed as defective before the filter itself has been checked.

Can You Clear the F0 / FO Error?

If the code is caused by a missing or improperly installed filter, properly installing the lint filter should correct the condition.

Try:

Turn the dryer off.
Remove the lint filter.
Inspect its position and filter housing.
Reinstall the filter completely.
Turn the dryer back on.
Try starting a cycle.

If F0/FO remains despite the correct filter being fully installed, the reed-switch circuit requires further diagnosis.

When to Call a Professional Technician

Professional diagnosis may be appropriate when:

The lint filter is installed but F0/FO remains.
The correct filter is being used.
The dryer still will not start.
The reed switch requires continuity testing.
Internal wiring or the filter-detection circuit requires inspection.

The technician should confirm that the filter magnet is correctly activating the reed switch before replacing unrelated dryer components.

Key Point

F0 (FO) means Filter Not Inserted Error.

If the lint filter is missing, the dryer can display the code and will not start. The first step is to properly install the lint filter.

The detection system works using a magnet embedded in the lint filter, which activates a reed switch mounted inside the plastic vent-duct housing. If the filter is installed correctly but the error remains, the source instructs technicians to check the lint filter reed switch for continuity.

F1 — Thermistor Error

The F1 error code on an LG dryer indicates a Thermistor Error.

This code is associated with the Main Thermistor, which is used by the dryer’s electronic control system to monitor temperature during operation.

According to the diagnostic reference, F1 is detected when the temperature associated with the Main Thermistor is:

Above 194°F (90°C).

This indicates an abnormal temperature-sensing condition that requires diagnosis of the thermistor circuit and related components.

What Does the F1 Error Code Mean?

The dryer uses a thermistor to provide temperature information to the Main PCB.

A thermistor is a temperature-sensitive resistor. Its electrical resistance changes as its temperature changes, allowing the electronic control to determine the approximate temperature within the monitored area.

If the Main PCB receives a thermistor signal corresponding to a temperature above the expected limit, the dryer can display:

F1 — Thermistor Error

For the configuration described by the source, the threshold is:

Temperature > 194°F (90°C).

What Is the Main Thermistor?

The Main Thermistor is part of the dryer’s temperature-monitoring system.

Unlike a simple thermostat that opens or closes at a predetermined temperature, a thermistor changes resistance progressively as temperature changes.

The Main PCB interprets this resistance to monitor dryer temperature and control operation.

An abnormal thermistor signal can therefore make the control believe that the dryer temperature is outside the expected range.

Common Causes of F1

When diagnosing F1, the primary areas to investigate are:

Main Thermistor
Thermistor resistance
Thermistor wiring
Electrical connectors
Main PCB

It is important to diagnose the circuit rather than automatically replacing the thermistor based only on the displayed code.

Check the Thermistor Connection

Before replacing components, inspect the electrical connections associated with the Main Thermistor.

Look for:

Loose connectors
Partially disconnected terminals
Damaged wiring
Poor electrical contact
Wiring damage near the sensor

A wiring or connector problem can change the signal received by the Main PCB and produce a temperature reading that does not accurately represent actual dryer conditions.

Check the Main Thermistor Resistance

The source provides a temperature/resistance chart for evaluating the Main Thermistor.

Because thermistor resistance changes with temperature, the measurement must be compared with the actual temperature of the thermistor.

In other words, a resistance value should not be evaluated by itself.

The correct approach is:

Measure thermistor temperature → Measure resistance → Compare both values with the temperature/resistance specification.

If the resistance does not correspond to the expected value for that temperature, the thermistor may be defective.

Why Temperature Matters During Resistance Testing

Thermistors are specifically designed to change resistance as temperature changes.

Therefore, measuring the sensor and simply asking whether it has continuity is not sufficient.

A thermistor can have electrical continuity while still producing an incorrect resistance value.

For accurate diagnosis, the technician should compare the measured resistance with the correct specification at the measured temperature.

Does F1 Mean the Dryer Is Actually Above 194°F?

Not necessarily.

The code indicates that the control is receiving a Main Thermistor condition corresponding to a temperature above 194°F (90°C).

That can result from an actual abnormal temperature condition, but a temperature-sensing problem can also cause the control to interpret the signal incorrectly.

For example, diagnosis may need to distinguish between:

Actual excessive temperature

and

Incorrect temperature information from the thermistor circuit.

This is why the thermistor and its circuit should be tested rather than assuming the dryer is physically operating at the temperature represented by the error.

Inspect the Wiring Between the Thermistor and Main PCB

If the thermistor itself tests correctly, inspect the electrical path between the sensor and the Main PCB.

A thermistor circuit depends on a reliable signal path.

Check for:

Loose connectors
Damaged wires
Broken conductors
Poor terminal contact
Connector problems at the Main PCB

The exact connector and terminal locations vary by dryer model, so use the wiring diagram for the specific appliance.

Does F1 Automatically Mean the Main Thermistor Is Bad?

No.

F1 identifies an abnormal thermistor-related condition, but the complete circuit should be checked.

A useful diagnostic sequence is:

Main Thermistor → Thermistor resistance → Wiring/connectors → Main PCB

Replacing the thermistor without testing it can result in unnecessary parts replacement if the actual problem is in the wiring or electronic control.

Main PCB Diagnosis

If the Main Thermistor measures correctly for its actual temperature and the wiring and connectors are in good condition, diagnosis may need to proceed toward the Main PCB.

The Main PCB interprets the thermistor signal.

If the sensor and its circuit are functioning normally but the board incorrectly processes that information, the control can still generate an abnormal temperature-related fault.

Main PCB replacement should therefore come after the sensor and wiring have been evaluated, rather than being the first repair attempted.

F1 vs. E1

Both codes involve temperature, but they refer to different systems.

E1 — Steam Module Overheating

E1 relates specifically to an excessive temperature condition within the steam system.

F1 — Main Thermistor Error

F1 relates to the temperature signal from the Main Thermistor.

Therefore:

E1 → Steam system temperature

F1 → Main dryer temperature-sensing circuit

They should not be diagnosed using the same procedure.

F1 vs. E4

E4 also involves temperature but is associated with steam generation.

E4 — Steam Heating Error

The steam system fails to reach its expected heating temperature within the specified time.

F1 — Thermistor Error

The Main Thermistor indicates an abnormal high-temperature condition.

This again shows why the exact code matters even when several codes appear to involve heating or temperature.

Is F1 an Airflow Error?

No.

F1 is specifically identified as a Thermistor Error.

It should not be confused with LG’s Flow Sense duct-restriction codes:

Those codes directly indicate an exhaust restriction condition.

F1 directs diagnosis toward the temperature-sensing system.

However, if the dryer is genuinely operating at an abnormally high temperature, the underlying reason for that excessive heat should also be investigated rather than only replacing the sensor.

Can You Clear the F1 Error?

A basic power cycle can be attempted:

Turn the dryer off.
Disconnect power.
Allow the dryer to cool.
Restore power.
Start the dryer.
Observe whether F1 returns.

If F1 was produced by a temporary abnormal condition, it may not immediately return.

However, repeatedly resetting the dryer will not repair a defective thermistor, damaged wiring, or control-board problem.

If F1 Returns After the Dryer Cools

If the dryer is cool but F1 quickly returns, the temperature-sensing circuit becomes especially important to investigate.

The technician should check:

Thermistor resistance → Thermistor connection → Wiring → Main PCB

and compare the sensor resistance against the appropriate temperature/resistance specification.

Model-Specific Diagnosis

Thermistor specifications, connector locations, wiring colors, and Main PCB connections can vary between LG dryer models.

Always confirm the complete model number before:

Ordering a thermistor
Testing specific connector pins
Using resistance specifications
Diagnosing the Main PCB
Replacing electronic components

Use the appropriate wiring diagram or service information for the exact dryer whenever possible.

When to Call a Professional Technician

Professional diagnosis is recommended when:

F1 repeatedly returns
Dryer appears to overheat
Main Thermistor requires resistance testing
Thermistor wiring requires inspection
Temperature/resistance specifications need to be compared
Main PCB requires diagnosis
Dryer stops operating because of the error

If the dryer is becoming unusually hot, stop using it until the cause has been identified.

Key Point

F1 means Thermistor Error.

According to the diagnostic reference, the code is associated with the Main Thermistor and an indicated temperature:

Above 194°F (90°C).

The correct diagnostic approach is:

Main Thermistor → Resistance compared with actual temperature → Wiring/connectors → Main PCB

Do not automatically replace the thermistor simply because F1 appears. First determine whether the sensor itself, its electrical circuit, or the control receiving the signal is responsible.

9A5 — Gas Dryer Not Heating Error

The 9A5 error code on an LG gas dryer indicates a No Heat condition.

The dryer displays 9A5 when the control system does not detect the expected temperature increase during operation. The dryer then stops the cycle.

This code applies specifically to the gas heating and ignition system and should direct troubleshooting toward the gas supply, igniter, flame detection system, gas valve, and associated electrical circuits.

What Does the 9A5 Error Code Mean?

During a heated drying cycle, an LG gas dryer expects the burner system to ignite and the exhaust temperature to begin rising.

If the expected temperature increase is not detected, the dryer recognizes a heating failure and may display:

9A5 — Gas Dryer Not Heating Error

The source describes the condition simply as a no heat issue where a temperature rise is not seen.

Check the Gas Supply First

The first troubleshooting step is to confirm that gas is actually available to the dryer.

According to the source, check the gas supplied to the appliance and make sure the customer gas supply valve is turned on.

Before disassembling the dryer, verify that:

The dryer has an active gas supply.
The gas shutoff valve is fully open.
There has not been an interruption in household gas service.
The problem did not begin immediately after installation or gas-line work.

A closed gas valve can produce a no-heat condition even when every component inside the dryer is functioning correctly.

Check the Ignition System

If the gas supply is available, the source directs diagnosis toward the ignition circuit.

The primary components to investigate include:

Igniter
Flame detector switch
Igniter-to-flame-holder gap
Gas valve system
Related wiring and electrical supply

The dryer must successfully complete several electrical and mechanical steps before gas ignition can occur.

How the LG Gas Dryer Ignition Sequence Works

The source provides a detailed explanation of the ignition sequence.

When the dryer motor is running and heat is required, the Main Control Board performs several operations.

First, the board closes the Black Relay, supplying the L1 side of the 120 VAC circuit to the igniter through the blue wire.

The board also verifies that the Flame Detector Switch is closed.

At the same time, the control supplies more than 90 VDC to Gas Valve 1.

Once the required conditions are satisfied, current flows through the igniter circuit.

Igniter Operation

The igniter begins heating as electrical current passes through it.

As it becomes hot, its radiant heat reaches the flame detector.

The source states that the flame detector switch opens at approximately:

370°F

Once the flame detector opens, the Main Control Board recognizes the change and proceeds with the next stage of the ignition sequence.

Gas Valve 2 Activation

After the flame detector switch opens, the Main Control Board applies more than:

90 VDC

to Gas Valve 2.

With both gas-valve solenoids energized, regulated gas can flow through the valve and mix with primary air.

The glowing igniter then ignites the gas-air mixture.

The sequence can be summarized as:

Motor running → Igniter energized → Igniter heats → Flame detector opens → Second gas valve energized → Gas flows → Burner ignites

Flame Detection After Ignition

Once the burner ignites, radiant heat from the burner keeps the Flame Detector Switch open.

The control uses this condition as part of the flame-proving circuit.

As the exhaust temperature rises, the exhaust temperature sensor detects the increase.

When the selected cycle reaches its designed temperature set point, the Main Control Board removes power from both gas-valve solenoids and turns off the gas supply.

The control simultaneously cycles the igniter circuit off.

What Happens If Ignition Fails?

The dryer is designed to attempt ignition again if the first attempt is unsuccessful.

If ignition does not occur, the flame detector cools and closes again at approximately:

320°F

When this happens, the control removes the voltage from Gas Valve 2, stopping gas flow through that portion of the valve system.

The igniter then heats again, the flame detector opens again, and the control makes another attempt to ignite the burner.

Check the Igniter

The source specifically identifies a bad igniter as one possible cause of the 9A5 no-heat condition.

A technician should verify whether the igniter receives its expected supply.

The source specifies:

120 VAC to the igniter.

It also notes that igniter current reaches approximately:

4 amps when ignition takes place.

These are technician-level electrical measurements and should be performed using the correct model-specific wiring information.

Check the Igniter-to-Flame-Holder Gap

The physical position of the igniter is also important.

According to the source, the distance between the igniter and flame holder should be:

3–6 mm

or approximately:

1/8–1/4 inch.

If the gap is outside this range, the source instructs technicians to adjust it.

Improper positioning can interfere with reliable ignition even when the igniter itself is heating.

Handle the Igniter Carefully

The source specifically warns that:

The igniter is fragile.

Care is required whenever the burner assembly is removed or serviced.

A damaged igniter can create an additional no-heat condition.

Check the Flame Detector Switch

The Flame Detector Switch plays two important roles in the ignition sequence.

Before ignition, it helps the Main Control Board verify the required starting condition.

As the igniter becomes hot, the switch opens and allows the control sequence to progress toward gas ignition.

After the burner ignites, burner heat keeps the switch open as part of the flame-proving process.

A failed flame detector or an open circuit in its wiring can prevent the gas valves from being energized correctly.

Check the Gas Valve Solenoids

The source specifies that the Main Control Board should provide at least:

90 VDC to both gas valves during the appropriate stages of ignition.

Gas Valve 1 and Gas Valve 2 are energized as part of a controlled sequence rather than simply being switched on simultaneously without verification.

If one of the solenoids does not operate correctly, the burner may fail to ignite.

The source specifically notes that DC Valve 1 solenoid has been a common failure.

Does a Glowing Igniter Mean the Gas System Is Working?

No.

A glowing igniter confirms only part of the ignition sequence.

The dryer still needs:

Correct flame-detector operation → Correct gas-valve activation → Gas flow → Successful ignition → Detected temperature rise

Therefore, a dryer can have a visibly glowing igniter and still display 9A5 if the burner never successfully lights.

Does 9A5 Automatically Mean the Gas Valve Is Bad?

No.

The source identifies several things that should be checked before replacing components:

Gas supply → Igniter → Flame detector → Igniter gap → Electrical supply → Gas valves

A closed household gas valve can create the same basic no-heat symptom as an internal ignition-system failure.

Is 9A5 an Airflow Error?

No.

9A5 specifically indicates that the gas dryer is not producing the expected heat.

Do not confuse it with:

d80 / d85 / d90 / d95 — Duct Restriction Errors

Those codes specifically direct troubleshooting toward exhaust airflow.

9A5 directs troubleshooting toward gas heating and ignition.

Is 9A5 Used on Electric Dryers?

The referenced diagnostic information specifically identifies this condition as:

Gas Dryer Not Heating Error.

Therefore, this diagnostic procedure should not be applied to an electric dryer.

Electric dryers use a different heating system and require a different no-heat diagnostic procedure.

What You Can Check Safely

Before internal service, a homeowner can perform a few basic checks:

Confirm that the dryer is a gas model.
Make sure the household gas supply is available.
Verify that the dryer gas shutoff valve is open.
Confirm that the dryer starts and the drum turns.
Record the exact 9A5 code and complete model number.

If the gas supply is available but the dryer still produces no heat, internal ignition-system diagnosis is appropriate.

When to Call a Professional Technician

Professional diagnosis is recommended when:

9A5 repeatedly returns.
Gas supply is confirmed but the dryer does not heat.
Igniter requires testing.
Flame detector requires diagnosis.
Igniter gap requires inspection or adjustment.
Gas-valve solenoids require testing.
120 VAC igniter supply needs to be measured.
Gas-valve DC voltage needs to be checked.
Burner assembly requires disassembly.

Gas appliances combine fuel gas, ignition, high temperatures, and electrical circuits, so internal gas-system repairs should be performed by a qualified technician.

Key Point

9A5 means Gas Dryer Not Heating Error.

The dryer displays this code when it does not detect the expected temperature rise and stops operation.

The source’s main diagnostic path is:

Gas supply → Ignition circuit → Igniter → Flame detector → Igniter gap → Gas valves

Important reference specifications from the source include:

Igniter supply: 120 VAC
Gas valves: at least 90 VDC
Igniter-to-flame-holder gap: 3–6 mm (1/8–1/4 in.)
Flame detector opening temperature: approximately 370°F
Flame detector closing temperature after failed ignition: approximately 320°F
Igniter current near ignition: approximately 4 amps

Do not replace the gas valve or igniter based on 9A5 alone. Start by confirming the gas supply, then diagnose the ignition sequence systematically.

HS — Humidity Sensor Error

The HS error code on an LG dryer indicates a Humidity Sensor Error.

Depending on the dryer model, LG may refer to this component as either the Humidity Sensor or the Moisture Sensor.

An important detail is that HS does not always mean the sensor has failed. According to the diagnostic reference, the code may appear during an Installation Check or Flow Sense Test if the dryer is still warm from previous operation.

What Does the HS Error Code Mean?

LG dryers use moisture- or humidity-sensing systems to help monitor drying conditions.

On applicable models, the HS code indicates an abnormal condition associated with this sensing system.

However, the exact interpretation depends on the dryer generation.

The source distinguishes between:

Older models — Humidity Sensor

and

Newer models — Moisture Sensor

This distinction matters because the diagnostic procedure is not identical for every LG dryer.

HS During Installation Check or Flow Sense Test

Before replacing any components, consider when the HS code appeared.

According to the source, HS may display if the dryer is not completely cool when an:

Installation Check
Flow Sense Test
Ductwork airflow test

is performed.

Both tests should be performed when the dryer is cold.

Why the Dryer Must Be Cold

The Flow Sense Test evaluates dryer behavior by looking for a temperature rise or lack of temperature rise.

If the dryer was operating shortly before the test and is still warm, the existing heat can interfere with the test’s ability to evaluate the temperature change correctly.

In simple terms:

Dryer already warm → Test starts with incorrect temperature conditions → Flow Sense result may be inaccurate → HS may appear

Therefore, an HS code during an installation test does not automatically prove that the humidity sensor is defective.

Let the Dryer Cool Before Retesting

If HS appeared immediately after the dryer had been operating:

Stop the test.
Allow the dryer to cool completely.
Do not immediately rerun Installation Check or Flow Sense.
Once the appliance is cold, run the test again.
Check whether HS returns.

If the test completes normally when the dryer is cold, sensor replacement may not be necessary.

Older LG Dryers — Humidity Sensor

The source states that older models use a component referred to as the Humidity Sensor.

For the configuration described on the source page, the sensor should measure:

550–600 Ω

between the:

Red wire → Black wire.

This resistance measurement can be used to evaluate the sensor electrically.

Humidity Sensor Resistance Test

For an older model using the referenced humidity-sensor configuration:

Expected resistance: 550–600 Ω

Measurement points: Red wire to Black wire.

If the resistance is outside the expected range, further diagnosis of the sensor and its circuit is appropriate.

Because LG dryer designs vary, confirm the exact model and wiring information before applying wire-color specifications to another dryer.

Newer LG Dryers — Moisture Sensor

The source specifically notes that on newer LG dryers, the component previously called the Humidity Sensor is now referred to by the factory as the:

Moisture Sensor.

This terminology difference can be confusing when searching service documentation or replacement parts.

Therefore:

Older terminology → Humidity Sensor

Newer terminology → Moisture Sensor

The exact sensor configuration should be determined from the dryer model.

HS on Newer LG Dryers

There is another important difference on newer models.

According to the source:

HS will only be displayed in Install Mode if the Moisture Sensor is shorted.

This makes HS especially important to interpret in context.

If the code appears during Install Mode on a newer dryer, diagnosis should focus on a possible shorted Moisture Sensor or its associated circuit.

Does HS Automatically Mean the Sensor Is Bad?

No.

This is probably the most important point for this code.

The source identifies two very different situations that can produce an HS-related result:

Situation 1 — Dryer is still warm

Running Installation Check or Flow Sense while the dryer is not completely cool can interfere with the test and cause HS to display.

Situation 2 — Sensor-related electrical problem

On older models, the humidity sensor can be evaluated using its resistance specification. On newer models, HS in Install Mode can indicate that the Moisture Sensor is shorted.

Therefore, do not replace the sensor before determining which situation applies.

What You Can Check First

Start with the simplest checks:

1. Determine when HS appeared.

Was it during normal drying, Installation Check, Flow Sense, or Install Mode?

2. Determine whether the dryer was already warm.

If it had just completed a cycle, allow it to cool completely.

3. Run the test again only when the dryer is cold.

This is specifically required for accurate Installation Check / Flow Sense results.

4. If HS returns, identify the dryer model.

Determine whether it uses the older Humidity Sensor configuration or the newer Moisture Sensor system.

5. Proceed with model-specific sensor diagnosis.

Do not assume that every LG dryer uses the same sensor or wiring.

Is HS a Duct Restriction Error?

No.

HS can appear while running a Flow Sense Test, but that does not make it one of LG’s normal duct-restriction codes.

The codes we already covered:

d80 / d85 / d90 / d95 → Duct Restriction Errors

while:

HS → Humidity / Moisture Sensor Error

The connection is that Flow Sense testing relies on temperature behavior, and running the test while the dryer is already warm can interfere with the diagnostic process.

HS vs. F1

Both HS and F1 involve sensors, but they monitor different conditions.

F1 — Thermistor Error

Associated with the Main Thermistor and temperature measurement.

HS — Humidity Sensor Error

Associated with the Humidity/Moisture Sensor system and, depending on the model, installation diagnostic testing.

Therefore:

F1 → Temperature sensing

HS → Humidity/moisture sensing

They should not be diagnosed using the same sensor or specifications.

Why Model Identification Is Important

The source itself separates older and newer models, which makes model identification particularly important for HS.

Before replacing or testing components, confirm:

Complete dryer model number
Whether the component is identified as Humidity Sensor or Moisture Sensor
Sensor wiring configuration
Correct diagnostic/test mode
Model-specific service information

Do not automatically apply the older 550–600 Ω red-to-black specification to a newer Moisture Sensor configuration.

Can You Clear the HS Error?

If HS appeared because Installation Check or Flow Sense was performed while the dryer was still warm, allowing the dryer to cool and rerunning the test under the correct conditions may resolve the issue.

If HS returns when the dryer is completely cold, further sensor diagnosis is appropriate.

Repeatedly restarting the test while the dryer remains warm will not provide an accurate result.

When to Call a Professional Technician

Professional diagnosis may be appropriate when:

HS repeatedly returns with the dryer completely cold.
Installation Check cannot complete correctly.
Flow Sense testing repeatedly produces HS.
Humidity Sensor resistance requires testing.
Moisture Sensor may be shorted.
Sensor wiring requires inspection.
The dryer model uses a sensor configuration that is unclear.

The exact diagnostic procedure should be matched to the dryer model.

Key Point

HS means Humidity Sensor Error.

Before replacing the sensor, check the testing conditions. LG’s diagnostic reference specifically warns that Installation Check and Flow Sense Test must be performed when the dryer is cold; running the test while the appliance is still warm can produce inaccurate results and may cause HS to appear.

For older models, the referenced Humidity Sensor should measure:

550–600 Ω between the red and black wires.

For newer models, LG refers to the component as the Moisture Sensor, and the source states that HS is displayed only in Install Mode if the sensor is shorted.

IF / 1F — Filter Missing Error

The IF (sometimes displayed or read as 1F) error code on an LG dryer indicates a Filter Missing Error.

This code appears when the dryer does not detect that the lint filter is properly installed.

The first troubleshooting step is therefore simple: make sure the lint filter is present and correctly seated in the filter housing.

What Does the IF / 1F Error Code Mean?

The lint filter is an important part of the dryer’s airflow system. It captures lint before the air enters the exhaust ductwork.

On LG dryer models equipped with filter-presence detection, the control system can determine whether the lint filter has been installed.

If the expected filter signal is missing, the dryer may display:

IF / 1F — Filter Missing Error

This does not necessarily mean that the lint filter is dirty or that the exhaust duct is restricted. It means that the dryer is not detecting the filter in its expected position.

Is the Code IF or 1F?

The code can easily be misread because of the way characters appear on a segmented appliance display.

The capital letter:

can look almost identical to the number:

For our troubleshooting guide, it is useful to include both search variations:

IF / 1F — Filter Missing Error

This helps users who search for either interpretation of the display.

Check the Lint Filter First

Start by checking whether the lint filter is installed.

If it is missing:

Locate the correct lint filter for the dryer.
Insert it into the filter housing.
Make sure it is fully seated.
Restart the dryer.
Check whether the IF/1F code disappears.

If the filter is already installed, remove it and reinstall it carefully.

Make Sure the Filter Is Fully Inserted

A filter can appear to be installed while not being completely seated.

Remove the filter and inspect the filter slot.

Look for:

Lint buildup preventing full insertion
Foreign objects in the filter housing
A bent or damaged filter frame
Improper positioning
A replacement filter that does not fit correctly

Reinstall the filter completely before testing the dryer again.

Check the Lint Filter Itself

Inspect the filter for physical damage.

A damaged or incorrect replacement filter may not interact correctly with the filter-detection system.

Pay particular attention if the error began shortly after the lint filter was:

Replaced
Removed for cleaning
Damaged
Reinstalled
Swapped for an aftermarket replacement

Verify that the filter is correct for the exact LG dryer model.

Filter Detection System

On applicable LG dryers, simply placing something inside the lint-filter opening is not enough.

The dryer must receive the expected signal from its filter-detection system.

If the correct filter is installed but IF/1F remains, diagnosis should move beyond the filter itself and toward the mechanism used by the dryer to determine whether the filter is present.

This may require inspection of the sensor/switch circuit and its electrical connections according to the service information for the specific model.

Does IF / 1F Mean the Filter Is Dirty?

No.

A dirty lint filter and a missing lint filter are different conditions.

IF / 1F indicates:

Filter not detected / Filter missing

It does not simply mean:

Clean the lint filter.

Of course, the lint filter should still be cleaned regularly because excessive lint can reduce airflow and drying performance.

IF / 1F vs. d80–d95

These codes should not be confused.

IF / 1F — Filter Missing Error

The dryer does not detect the lint filter.

d80 / d85 / d90 / d95 — Duct Restriction Errors

The dryer detects an exhaust airflow restriction.

So:

IF / 1F → Is the lint filter installed and detected?

d80–d95 → Can exhaust air move through the vent system properly?

They involve the dryer’s airflow system but represent different diagnostic conditions.

IF / 1F vs. F0 / FO

This is another important distinction because we already have F0 / FO — Filter Not Inserted Error in the LG dryer code list.

Both codes relate to lint-filter detection, but they should not automatically be treated as interchangeable codes across every LG dryer model.

Different LG dryer generations and configurations can use different diagnostic codes and detection systems.

Therefore, our guide should keep separate entries for:

F0 / FO — Filter Not Inserted Error

and

IF / 1F — Filter Missing Error

rather than merging them into one code.

Why the Dryer Monitors the Lint Filter

Operating a dryer without its lint filter can allow lint and debris to enter areas where they should normally be captured.

The filter-presence system helps ensure that the dryer is operated with the required lint filter installed.

If the control cannot confirm the filter’s presence, it can interrupt operation or display a diagnostic code.

Can You Clear the IF / 1F Error?

If the code was caused by a missing or improperly installed lint filter, correcting the filter position may clear the condition.

Try:

Turn the dryer off.
Remove the lint filter.
Inspect the filter and housing.
Clean away lint that interferes with installation.
Reinstall the filter completely.
Turn the dryer back on.
Start a cycle.

If IF/1F returns despite the correct filter being properly installed, further diagnosis of the filter-detection system is required.

Do Not Bypass the Filter Detection System

If the dryer refuses to operate because it cannot detect the lint filter, do not attempt to permanently bypass the detection system.

Instead, determine why the dryer cannot recognize the installed filter.

The correct repair is to restore normal filter detection so that the dryer can operate with its lint filter properly installed.

Does IF / 1F Mean the Main PCB Is Bad?

Not automatically.

A Main PCB should not be replaced simply because IF/1F appears.

Start with the component directly associated with the code:

Lint filter → Correct installation → Filter condition → Filter detection system → Wiring/connectors

Only proceed toward electronic control diagnosis if the filter and its detection circuit have been verified according to the model-specific service information.

Model-Specific Diagnosis Is Important

LG dryer designs vary by model and production generation.

Before replacing any component, confirm:

Complete dryer model number
Correct lint filter part
Filter-presence detection method
Sensor or switch configuration
Wiring diagram
Relevant service procedure

This is particularly important because LG uses more than one filter-related diagnostic code.

When to Call a Professional Technician

Professional diagnosis may be appropriate when:

IF/1F remains with the lint filter properly installed.
The correct lint filter is being used.
The filter cannot seat normally.
The dryer does not recognize the filter.
Filter-detection components require testing.
Internal wiring or connectors require inspection.

A technician can determine whether the problem is the filter itself, its positioning, the detection mechanism, wiring, or another part of the control circuit.

Key Point

IF / 1F means Filter Missing Error.

Start by confirming that the lint filter is installed correctly and fully seated.

If the correct filter is installed but the code remains, the dryer’s filter-detection system should be investigated rather than assuming that the exhaust duct is restricted or replacing unrelated heating components.

Also, do not confuse this code with LG’s d80–d95 duct-restriction errors. IF/1F is specifically concerned with the dryer detecting the lint filter.

LE1 — Motor Error

The LE1 error code on an LG dryer indicates a Motor Error.

This error is associated with the dryer’s drum drive motor system. The dryer has detected an abnormal condition involving motor operation and cannot confirm that the motor is operating as expected.

Because the motor system includes the motor itself, wiring, connectors, and electronic control, an LE1 code does not automatically mean that the motor must be replaced.

What Does the LE1 Error Code Mean?

The dryer motor is responsible for turning the drum and driving the airflow system during a drying cycle.

When a cycle starts, the Main PCB controls the motor and expects the motor system to operate normally.

If the control detects an abnormal motor condition, the dryer may display:

LE1 — Motor Error

Depending on the failure, the dryer may:

Fail to start
Stop shortly after starting
Fail to rotate the drum
Operate intermittently
Display LE1 repeatedly

The exact behavior can vary by model and by the underlying cause.

Common Causes of LE1

The motor-related system should be checked systematically rather than replacing the motor immediately.

Areas that may require inspection include:

Motor electrical connections
Wiring harness
Motor connector
Motor windings
Main PCB
Motor-control circuit

The diagnostic goal is to determine whether the motor itself has failed or whether the motor is simply not receiving the electrical conditions required for operation.

Check the Motor Connection First

Before replacing components, inspect the electrical connections associated with the dryer motor.

Check for:

Loose connector
Partially disconnected connector
Damaged terminal
Burned connection
Broken wiring
Harness damage
Poor contact at the motor
Poor connection at the Main PCB

A motor cannot operate correctly if the electrical path between the Main PCB and motor is interrupted.

Inspect the Wiring Harness

Follow the wiring between the motor and electronic control as far as practical.

Look for signs of:

Pinched wires
Broken conductors
Loose terminals
Heat damage
Corrosion
Connector damage

A wiring problem can produce symptoms similar to a failed motor.

This is why replacing the motor based only on LE1 can lead to unnecessary parts replacement.

Check the Motor Resistance

The motor windings can be evaluated electrically by measuring resistance.

Resistance testing can help identify conditions such as:

Open motor winding
Shorted winding
Abnormal winding resistance

The dryer should be disconnected from power before resistance measurements are performed.

The measured values should be compared with the specifications for the exact LG dryer model.

Why Motor Resistance Matters

A motor contains electrical windings that create the magnetic fields required for rotation.

If a winding becomes electrically open or develops an abnormal resistance, the motor may no longer operate correctly even if the Main PCB is providing the proper control signal.

Resistance testing therefore helps answer an important diagnostic question:

Is the motor electrically capable of operating?

However, resistance alone does not provide a complete diagnosis.

A motor can measure electrically normal while another problem prevents it from operating under load.

Does LE1 Automatically Mean the Motor Is Bad?

No.

LE1 identifies a problem associated with the motor system, but the motor itself is only one part of that system.

A logical diagnostic sequence is:

Motor connection → Wiring harness → Motor resistance → Motor operation → Main PCB/control

This helps separate an actual motor failure from a wiring or control problem.

Check Whether the Drum Can Rotate

With the dryer disconnected from power, check whether the drum can rotate normally by hand.

The drum should not be completely locked.

Abnormal mechanical resistance can place excessive load on the motor and should be investigated before installing a replacement motor.

Possible mechanical areas requiring inspection can include the drum-support and drive system.

However, LE1 itself should not be used to declare any specific mechanical component defective without additional diagnosis.

If the Drum Does Not Turn

If the dryer starts but the drum does not rotate, determine whether the problem is:

Mechanical

Electrical

A mechanically restricted drum can prevent normal motor operation.

An electrically defective motor or missing motor-control signal can produce a similar symptom.

Therefore, the symptom “drum not turning” alone is not enough to determine which component has failed.

If the Dryer Starts and Then Stops

An intermittent LE1 condition can require more than a simple continuity check.

Inspect:

Motor connectors
Harness connections
Motor condition
Signs of overheating
Main PCB connections

A connection that works when cold but becomes unreliable during vibration or operation can create intermittent symptoms.

The exact diagnostic procedure should follow the service information for the dryer model.

Main PCB Diagnosis

If:

Motor connections are secure
Wiring is intact
Motor resistance is correct
Motor and drum system do not show an obvious mechanical problem

then diagnosis may need to proceed toward the Main PCB.

The Main PCB is responsible for controlling dryer operation, including the motor circuit.

A control problem can prevent an otherwise functional motor from operating correctly.

Do Not Replace the Main PCB First

The Main PCB should not automatically be replaced when LE1 appears.

Electronic control boards are relatively expensive components, and a connection, wiring, or motor problem can create a similar motor-related fault.

A better sequence is:

Connections → Wiring → Motor → Control

This reduces unnecessary component replacement.

LE1 vs. LE2 and LE3

The exact code matters because LG uses several LE-family dryer errors.

Do not assume:

LE1 = LE2 = LE3

Each code should be checked against its own LG diagnostic reference.

For this page, LE1 should remain a separate entry:

LE1 — Motor Error

We should verify LE2 and LE3 individually before describing what systems those codes represent.

LE1 vs. Washer LE Codes

LG washers also use LE-family codes, but their meanings and diagnostic procedures should not be transferred to LG dryers.

For example, the LG washer LE code we covered previously is associated with a Locked Rotor Error.

That does not mean an LG dryer LE1 should be diagnosed using the washer procedure.

Always use appliance-specific diagnostic information.

Is LE1 a Heating Error?

No.

LE1 primarily directs diagnosis toward the motor system.

It should not automatically lead to replacement of:

Heating element
Gas valve
Igniter
Steam generator
Main thermistor

A dryer may fail to produce normal heat if the motor and airflow system are not operating, but that would be a consequence of the operating problem rather than proof that the heating components themselves have failed.

Can You Reset the LE1 Error?

A basic power reset can be attempted:

Turn the dryer off.
Disconnect it from power.
Wait several minutes.
Restore power.
Start a normal cycle.
Observe whether LE1 returns.

If the error was caused by a temporary electronic condition, the dryer may resume normal operation.

If LE1 repeatedly returns, resetting the dryer will not repair a failed motor, damaged wiring, loose connector, or control problem.

What You Can Check Before Service

Before internal electrical diagnosis:

Turn the dryer off and disconnect power.
Confirm that nothing is preventing normal drum movement.
Check whether the drum can rotate.
Record the exact error code.
Record the complete dryer model number.
If qualified to service the appliance, inspect motor wiring and connectors.

Do not perform live electrical measurements without the appropriate service information and experience.

Why the Exact Model Number Matters

LG uses different motor and control configurations across dryer models.

Model-specific information may determine:

Motor type
Motor resistance specifications
Connector locations
Wiring colors
Main PCB connections
Diagnostic procedure
Replacement part numbers

For this reason, electrical values should be taken from the service information for the exact dryer rather than assumed to be universal.

When to Call a Professional Technician

Professional diagnosis is recommended when:

LE1 repeatedly returns
Drum will not rotate
Dryer stops shortly after starting
Motor wiring requires inspection
Motor resistance needs to be measured
Motor operation requires electrical testing
Main PCB requires diagnosis

A technician can determine whether the fault originates in the motor, its electrical connections, wiring, mechanical load, or electronic control.

Key Point

LE1 means Motor Error.

The code directs troubleshooting toward the dryer’s motor system.

Do not automatically replace the motor when LE1 appears. A systematic diagnosis should proceed through:

Motor connections → Wiring harness → Motor electrical condition → Motor operation → Main PCB/control

If the connections and wiring are good but LE1 continues, the motor and control system require model-specific electrical diagnosis.

LE2 — Drum Motor Low Amperage / Compressor Error

The LE2 error code on an LG dryer has different meanings depending on the dryer type.

On a standard condensing dryer, LE2 indicates a:

Drum Motor Has Low Amperage Error

On an LG heat pump dryer, LE2 indicates a:

Compressor Error

For this reason, identifying the exact dryer model and configuration is essential before diagnosing LE2.

What Does the LE2 Error Code Mean?

LE2 is a model-dependent diagnostic code.

The same displayed code can direct troubleshooting toward two completely different systems:

Standard Condensing Dryer
→ Drum motor system

Heat Pump Dryer
→ Compressor system

Do not order a motor, compressor, or Main PCB based on the LE2 code alone.

First determine which dryer design you are working with.

LE2 on Standard Condensing Dryers

For a standard condensing dryer, the source identifies LE2 as:

Drum Motor Has Low Amperage Error

The diagnostic information identifies two primary areas to check:

Clogged lint filter
Main PCB not supplying voltage to the drum motor

The source then provides electrical specifications for testing the drum motor.

Check the Lint Filter First

For a standard condensing dryer, the first cause listed by the source is a:

Clogged lint filter

The prescribed solution is straightforward:

If the filter is clogged, clean the filter.

This should be checked before moving into electrical diagnosis.

Remove the lint filter and clean accumulated lint and debris. Make sure the filter is properly installed before testing the dryer again.

Why Start With the Lint Filter?

LE2 may sound like an error that automatically requires motor replacement, but the diagnostic reference specifically places a clogged lint filter among the causes.

This makes the initial troubleshooting sequence important:

Check lint filter → Check motor circuit → Check Main PCB

Do not skip the simple airflow-related check and immediately replace the motor.

Check the Drum Motor Windings

If the lint filter is clean and LE2 remains, the source instructs technicians to check each motor winding for the proper resistance.

For the standard condensing configuration described by the reference:

U to V = 20 Ω ± 2 Ω
V to W = 20 Ω ± 2 Ω
W to U = 20 Ω ± 2 Ω

All three winding measurements should be evaluated.

Why All Three Windings Matter

The motor uses multiple windings, so checking only one pair of terminals is not enough.

The diagnostic reference expects approximately the same resistance across:

U ↔ V
V ↔ W
W ↔ U

If any winding is outside the specified range, the source directs repair toward:

Replace the motor.

Check Motor Voltage

The source also instructs technicians to check the motor winding circuit for:

220–240 VAC.

This helps distinguish between a defective motor and a situation where the motor is not receiving the expected electrical supply.

Because this involves potentially lethal line voltage, live testing should be performed only by a qualified technician using the correct service information.

What If the Motor Resistance Is Incorrect?

For the configuration covered by the source:

Any winding outside 20 Ω ± 2 Ω → Replace the motor.

This is more specific than simply interpreting LE2 as a generic motor failure.

The motor should first be electrically tested against its expected winding values.

What If the Main PCB Does Not Supply Voltage?

The source identifies another LE2 cause:

Main PCB is not supplying voltage to the drum motor.

It instructs technicians to check the Main PCB voltage output.

If the Main Board does not produce the required voltage, the source directs repair toward:

Replace the Main Board.

Therefore:

Abnormal motor winding → Motor

No required output from Main PCB → Main PCB

Motor Wire Colors

The source states that the motor wires are usually:

Blue
Orange
White

However, it also specifically notes that motor wire colors may vary.

For this reason, identify the motor terminals and consult the wiring information for the exact dryer rather than relying only on wire color.

The winding specifications given by the source remain:

20 Ω ± 2 Ω between each pair of motor windings.

LE2 on Heat Pump Dryers

LE2 has a completely different meaning on applicable LG heat pump dryers.

For these models, the source identifies LE2 as:

Compressor Error

and lists the cause as:

Compressor failure.

Troubleshooting therefore moves away from the drum motor and toward the heat-pump compressor circuit.

How to Identify the Heat Pump Models

The source provides useful model-number guidance.

It states that a dryer whose model begins with:

DLH

is a heat pump dryer.

It also identifies applicable WashTower models beginning with:

WKH

as heat-pump configurations.

This provides a quick initial clue, although the complete model number should still be verified before diagnosis.

Check the Heat Pump Compressor

For a heat-pump dryer displaying LE2, the source instructs technicians to check:

Compressor voltage
Compressor winding resistance

Depending on the results, repair may require:

Compressor replacement
Main PCB replacement

The exact specifications depend on the compressor configuration.

120 VAC Compressor Specifications

For one compressor configuration, the source provides:

Yellow → Blue = 1.21 Ω ±7%

Yellow → White = 5.04 Ω ±7%

with a supply voltage of:

120 VAC.

The wiring diagram shown by the source is specifically identified as being from model:

DLHX4072

Therefore, these values should not automatically be applied to every LG heat-pump dryer.

240 VAC Inverter BLDC Compressor Specifications

The source separately provides an example for a heat-pump dryer using an Inverter BLDC Compressor rated at 240 VAC.

The expected resistance measurements are:

Blue → Red = 2.56 Ω ±0.3 Ω

Red → Black = 2.56 Ω ±0.3 Ω

Black → Blue = 2.56 Ω ±0.3 Ω

This is a different compressor configuration from the 120 VAC example.

Do Not Mix the Compressor Specifications

This distinction is critical.

The source describes at least two heat-pump compressor configurations:

120 VAC compressor

Yellow → Blue: 1.21 Ω ±7%
Yellow → White: 5.04 Ω ±7%

240 VAC Inverter BLDC compressor

Blue → Red: 2.56 Ω ±0.3 Ω
Red → Black: 2.56 Ω ±0.3 Ω
Black → Blue: 2.56 Ω ±0.3 Ω

Determine which compressor the dryer actually uses before applying resistance specifications.

Does LE2 Automatically Mean the Drum Motor Is Bad?

No.

On a standard condensing dryer, the source first identifies:

Clogged lint filter
Main PCB voltage output
Motor winding condition

And on a heat-pump dryer, LE2 does not primarily refer to the drum motor at all—it refers to the compressor.

Therefore, “LE2 = bad drum motor” would be an incorrect universal interpretation.

Does LE2 Automatically Mean the Compressor Is Bad?

No.

That interpretation is only applicable to the heat-pump version of the code.

Even then, the source instructs technicians to check:

Compressor voltage + Compressor winding values

and notes that repair may require either the:

Compressor or Main PCB.

Electrical diagnosis should therefore precede component replacement.

LE1 vs. LE2

The distinction from the previous code is now much clearer.

LE1 — Motor Error

directs diagnosis toward the motor system.

LE2 — Model-dependent

Standard condensing dryer → Drum Motor Has Low Amperage Error
Heat pump dryer → Compressor Error

So LE2 requires an additional first step:

Identify the dryer type.

What You Can Check First

If LE2 appears:

Record the complete model number.
Determine whether the dryer is standard condensing or heat pump.
On a standard condensing model, clean and correctly install the lint filter.
Restart the dryer and see whether LE2 returns.
If the code remains, proceed with model-specific electrical diagnosis.

For a heat-pump dryer, compressor diagnosis should generally be performed by a qualified technician.

When to Call a Professional Technician

Professional diagnosis is recommended when:

LE2 repeatedly returns.
Lint filter is clean but LE2 remains.
Drum motor windings require testing.
220–240 VAC motor supply requires measurement.
Main PCB output requires diagnosis.
Dryer is a heat-pump model.
Compressor winding resistance requires testing.
Compressor voltage requires measurement.
Compressor or Main PCB replacement may be necessary.

Key Point

LE2 has two different meanings depending on the LG dryer type.

For a standard condensing dryer:

LE2 = Drum Motor Has Low Amperage Error

Start with the lint filter. If further diagnosis is necessary, the source specifies:

U–V = 20 Ω ±2 Ω
V–W = 20 Ω ±2 Ω
W–U = 20 Ω ±2 Ω
Motor circuit = 220–240 VAC.

For a heat-pump dryer:

LE2 = Compressor Error

The compressor voltage and winding resistance must be checked using the specifications for the actual compressor configuration.

LE3 — Heat Pump Restricted Fan Error

The LE3 error code on an LG heat pump dryer indicates a Restricted Fan Error.

This error occurs when the dryer’s Dry Fan attempts to restart three times but cannot resume normal operation.

LE3 is specifically associated with the fan system used in applicable LG heat pump dryer models.

What Does the LE3 Error Code Mean?

The Dry Fan is an important part of the heat pump drying system. It helps move air through the system so heat and moisture can be transferred efficiently during operation.

When the control detects that the Dry Fan is unable to operate normally, it attempts to restart the fan.

If the fan attempts to restart three times without successfully returning to normal operation, the dryer may display:

LE3 — Heat Pump Restricted Fan Error.

Common Causes of LE3

According to the diagnostic reference, the main areas to investigate are:

Restricted or blocked Dry Fan
DC Harness problem
Dry Fan motor problem
Main PCB problem

The fan itself should therefore not be replaced until the mechanical and electrical parts of the circuit have been checked.

Check Whether the Dry Fan Is Restricted

The first step is to determine whether the fan can move normally.

The source specifically instructs technicians to:

Check if the fan is restricted and cannot move.

With the dryer disconnected from power, inspect the fan area for anything that could interfere with rotation.

A physical restriction can prevent the fan from starting even when the motor and control electronics are functioning correctly.

Where Is the Dry Fan Located?

According to the source, the Dry Fan is part of the base assembly.

It is located in the:

Right rear corner of the base assembly.

The Main PCB is also located on the base assembly, but on the:

Left side.

This information is useful when tracing the fan wiring and checking the connection between the Dry Fan and Main PCB.

Check the Dry Fan Motor Windings

If the fan is not physically restricted, the motor windings should be checked.

The source provides the following resistance specifications:

U to V = 15 Ω ±2 Ω

V to W = 15 Ω ±2 Ω

W to U = 15 Ω ±2 Ω.

All three winding pairs should be checked.

How to Interpret the Resistance Measurements

The three winding measurements should fall within the specified range.

That means approximately:

13–17 Ω per winding pair

based on the stated 15 Ω ±2 Ω specification.

The diagnostic sequence is:

U ↔ V → 15 Ω ±2 Ω
V ↔ W → 15 Ω ±2 Ω
W ↔ U → 15 Ω ±2 Ω

If any winding is outside the specified range, the source directs technicians to:

Replace the motor.

Check the Motor From the Main PCB

The reference specifically instructs technicians to check each motor winding from the Main PCB.

This is useful because the measurement can help evaluate not only the motor circuit but also the electrical path between the control and fan.

If an abnormal reading is found, the wiring and connections should also be considered before replacing components.

Dry Fan Wire Colors

The source states that the motor wires are usually:

Blue
Red
Black

However, it also warns that motor wire colors may vary.

Therefore, wire color alone should not be used to identify the windings on every LG dryer.

The important reference specification is:

15 Ω ±2 Ω between each motor winding pair.

Check the DC Harness

If the Dry Fan is not mechanically restricted, the source also identifies the:

DC Harness

as a possible repair area.

Inspect the fan harness and connectors for:

Loose connections
Partially disconnected connectors
Damaged terminals
Broken wiring
Pinched wires
Heat damage
Poor electrical contact

A harness problem can prevent a functional fan motor from receiving the electrical control required for operation.

Check the Main PCB

If the Dry Fan motor and wiring are good, diagnosis should proceed toward the Main PCB.

The source states:

If the main board does not produce voltage, replace the main board.

This distinction is important because LE3 can result from either side of the circuit.

Abnormal motor winding resistance → Dry Fan motor

No required output from Main PCB → Main PCB

Does LE3 Automatically Mean the Fan Motor Is Bad?

No.

LE3 means that the Dry Fan has failed to restart successfully after three attempts.

That can happen because:

Fan cannot physically move → Harness problem → Fan motor electrical problem → Main PCB/control problem

The correct diagnostic sequence should therefore identify which part of the system is preventing normal fan operation.

LE3 vs. LE1

These codes involve different motor systems.

LE1 — Motor Error

primarily directs diagnosis toward the dryer’s main motor system.

LE3 — Heat Pump Restricted Fan Error

specifically concerns the Dry Fan on applicable heat pump dryers.

The Dry Fan should not be confused with the primary drum drive motor.

LE3 vs. LE2

LE2 and LE3 can both occur on LG heat pump dryers, but they represent different systems.

LE2 — Compressor Error on heat pump models

LE3 — Restricted Dry Fan Error

Therefore:

LE2 → Heat pump compressor system

LE3 → Heat pump Dry Fan system

This distinction helps narrow the diagnostic process before the dryer is disassembled.

Is LE3 an Airflow Restriction Code?

LE3 involves a fan that moves air, but it should not be confused with LG’s normal exhaust duct restriction codes:

d80 / d85 / d90 / d95 → Exhaust duct restriction

LE3 → Heat pump Dry Fan cannot operate normally

The diagnostic reference specifically directs LE3 troubleshooting toward the Dry Fan, DC Harness, Main PCB, and fan motor.

Can You Reset the LE3 Error?

A power reset may temporarily clear the displayed code, but it will not correct a mechanically restricted fan, damaged harness, defective motor, or control problem.

If LE3 returns after restarting the dryer, the fan system should be inspected.

Repeated resets are not a substitute for diagnosis because the control has already detected repeated unsuccessful fan restart attempts.

What You Can Check First

If LE3 appears:

Record the complete dryer model number.
Turn the dryer off and disconnect it from power.
Confirm that the appliance is an applicable heat pump model.
Inspect the Dry Fan for an obvious physical restriction.
Check accessible fan wiring and connectors for damage.
If the code remains, proceed with electrical diagnosis.

Motor resistance and Main PCB output testing should be performed using the appropriate service procedures.

When to Call a Professional Technician

Professional diagnosis is recommended when:

LE3 repeatedly returns.
Dry Fan does not operate.
Fan movement is restricted.
DC Harness requires testing.
Motor windings require resistance measurements.
Main PCB output requires testing.
Dry Fan motor or Main PCB may require replacement.

Heat pump dryers contain additional refrigeration, airflow, and electronic systems compared with conventional dryers, making correct diagnosis especially important.

Key Point

LE3 means Heat Pump Models Restricted Fan Error.

The code occurs when the Dry Fan has attempted to restart three times without successfully resuming normal operation.

The main diagnostic path is:

Check for fan restriction → Check DC Harness → Check Dry Fan motor → Check Main PCB

For the Dry Fan motor, the source specifies:

U–V = 15 Ω ±2 Ω
V–W = 15 Ω ±2 Ω
W–U = 15 Ω ±2 Ω

If any winding is outside the specified range, replace the motor. If the Main PCB does not produce the required voltage, the source directs replacement of the Main PCB.

nC — NFC Module Error

The nC error code on an LG dryer indicates an NFC Module Error.

This code is associated with the dryer’s NFC (Near Field Communication) module and indicates that the control system has detected an abnormal electrical condition in the NFC module circuit.

According to LG diagnostic information, the condition occurs when the:

NFC module is open or shorted.

What Does the nC Error Code Mean?

On applicable LG dryers, the NFC module provides a short-range communication function used by certain smart or diagnostic features.

When the dryer detects an open or short circuit involving this module, it can register:

nC — NFC Module Error

This is an electronic communication-module fault rather than a heating, airflow, motor, or temperature-sensor error.

nC Is Displayed Only in Test Mode

One of the most important details about nC is that it is not normally displayed during everyday dryer operation.

LG’s diagnostic reference states that:

nC or nU is displayed only in Test Mode.

Therefore, a technician or user may encounter nC while running diagnostic testing even though the code has never appeared during a normal drying cycle.

What Causes the nC Error?

The specified cause is an NFC module that is electrically:

Open, or
Shorted.

An open circuit means the expected electrical path through the module is interrupted.

A short circuit indicates an abnormal low-resistance electrical path within the module or associated circuit.

Either condition prevents the NFC system from operating as expected.

Is nC a Dryer Heating Error?

No.

nC does not directly indicate a problem with the dryer’s heating system.

It should not automatically lead to diagnosis of:

Heating element
Gas burner
Igniter
Heat-pump compressor
Thermistor
Exhaust duct

The code specifically directs diagnosis toward the NFC module.

Is nC an Airflow Error?

No.

Do not confuse nC with LG’s Flow Sense codes:

d80 / d85 / d90 / d95 → Duct restriction

nC → NFC Module Error

These codes represent completely different systems.

Does nC Prevent the Dryer From Drying Clothes?

Because nC concerns the NFC communication module rather than the primary heating or drum systems, the code should be interpreted within the context in which it appears.

Most importantly, LG specifies that nC appears only in Test Mode.

Do not assume that a Test Mode nC code explains an unrelated complaint such as:

Dryer not heating
Drum not turning
Clothes taking too long to dry
Dryer overheating

Those symptoms should be diagnosed separately.

Check the NFC Module

If nC is detected during Test Mode, diagnosis should focus on the NFC module and its electrical circuit.

A technician may need to inspect:

NFC module
Module connector
Associated wiring
Electrical continuity
Signs of an open or short circuit

The complete dryer model number should be used to locate the correct NFC module and wiring information.

Does nC Automatically Mean the Main PCB Is Bad?

No.

The source identifies the NFC module as the component associated with this error and directs repair toward replacing that module.

There is no basis for replacing the Main PCB solely because nC appears.

The NFC system should be diagnosed first.

Can You Clear the nC Error?

Because nC represents an electrical fault involving the NFC module, simply resetting the dryer does not repair an open or shorted module.

A power reset may clear a temporarily displayed diagnostic message, but if the underlying NFC fault remains, the condition can be detected again when Test Mode is performed.

nC vs. nU

LG’s source specifically groups these two codes together by stating:

nC or nU is displayed only in Test Mode.

However, we should still keep nC and nU as separate accordion entries in our LG Dryer Error Codes guide.

We will verify the direct nU reference separately rather than assuming that every diagnostic detail is identical.

Why the Exact Dryer Model Matters

Not every LG dryer uses the same communication features or electronic configuration.

Before replacing an NFC module, confirm:

Complete model number
Whether the dryer is equipped with the NFC system
Correct NFC module
Connector configuration
Model-specific wiring information

This helps prevent replacing an incompatible or unrelated component.

When to Call a Professional Technician

Professional diagnosis may be appropriate when:

nC appears during Test Mode.
The NFC module requires electrical testing.
NFC wiring or connectors require inspection.
An open or short circuit needs to be confirmed.
NFC module replacement is required.

Because this is an electronic-module fault, diagnosis should be based on the wiring and service information for the exact dryer model.

Key Point

nC means NFC Module Error.

LG identifies the cause as an NFC module that is open or shorted and specifies that:

nC is displayed only in Test Mode.

The prescribed solution in the diagnostic reference is:

Replace the NFC module.

Do not confuse nC with an airflow, heating, motor, or temperature-sensor error.

nE — Modem Is Abnormal Error

The nE error code on an LG dryer indicates a Modem Is Abnormal Error.

This code is associated with the dryer’s Wi-Fi communication system. It appears when there is a communication problem between the customer’s router and the dryer’s Wi-Fi module.

Importantly, LG’s diagnostic reference states that nE is displayed only in Test Mode.

What Does the nE Error Code Mean?

On compatible LG smart dryers, the Wi-Fi module allows the appliance to communicate with a wireless network and supported connected features.

The nE code indicates that the dryer has detected an abnormal condition involving communication between:

Home Wi-Fi Router ↔ Dryer Wi-Fi Module

This is a connectivity-related diagnostic condition rather than a heating, airflow, motor, or temperature-sensor fault.

nE Appears Only in Test Mode

One of the most important details about nE is that it is:

Only displayed in Test Mode.

This means a technician may encounter nE while performing dryer diagnostics even though the code does not normally appear during everyday drying cycles.

The context in which the code appears is therefore important when determining whether it is related to the customer’s primary complaint.

What Causes the nE Error?

According to the diagnostic reference, nE occurs when there is a problem with communication between the:

Customer’s router
Dryer Wi-Fi module

The problem may originate from the network/router side or from the Wi-Fi module installed in the dryer.

Check or Reset the Router

The first troubleshooting step is to check the customer’s router.

If nE appears during Test Mode:

Confirm that the router is operating normally.
Check the home’s Wi-Fi connection.
Restart or reset the router if necessary.
Allow the router to reconnect.
Check the dryer communication again.

A temporary router or network communication problem does not automatically mean that a component inside the dryer has failed.

Check the Dryer Wi-Fi Module

If the router is operating normally but nE remains, the dryer’s Wi-Fi module should be investigated.

The module provides the wireless communication interface between the dryer and the home network.

If the module is defective and cannot establish normal communication, the diagnostic reference directs repair toward:

Replacing the Wi-Fi module.

Does nE Mean the Main PCB Is Bad?

Not based on this code alone.

The diagnostic reference specifically directs attention toward:

Router → Wi-Fi module

It does not identify the Main PCB as the primary repair for nE.

Therefore, replacing the Main PCB simply because nE appears would not be the appropriate first diagnostic step.

Is nE a Heating Error?

No.

nE does not directly indicate a problem with:

Heating element
Gas burner
Heat pump
Compressor
Thermistor
Drum motor
Exhaust airflow

It is specifically associated with wireless communication.

If the dryer has a separate complaint such as no heat or poor drying performance, that problem should be diagnosed independently.

Can the Dryer Still Operate With nE?

Because nE is associated with the Wi-Fi communication system and is shown only in Test Mode, it should not automatically be interpreted as a failure of the dryer’s primary drying systems.

A dryer can have a connectivity problem that is separate from its ability to tumble and produce heat.

The exact effect on smart features can vary by model and configuration.

nE vs. nC

These two codes are both related to communication features, but they identify different systems:

nC — NFC Module Error
Associated with the NFC module.

nE — Modem Is Abnormal Error
Associated with communication between the router and Wi-Fi module.

Both are electronic communication-related codes, but they should remain separate entries in the LG Dryer Error Codes guide.

nE vs. nF

Do not assume that nE and nF mean the same thing.

For nE, the direct diagnostic reference identifies an abnormal communication condition involving the:

Router ↔ Wi-Fi module

We should verify the separate nF reference before assigning its exact meaning and troubleshooting procedure.

What You Can Check First

If nE appears during Test Mode:

Confirm that the home router is powered on.
Verify that the Wi-Fi network is operating.
Restart or reset the router if necessary.
Retry the connection.
If the router is working but nE remains, investigate the dryer Wi-Fi module.

This sequence helps distinguish a network-side problem from an appliance-side module failure.

Can You Clear the nE Error?

If the error results from a temporary router or communication problem, restoring the network connection or resetting the router may resolve the condition.

If nE continues because the dryer Wi-Fi module is defective, repeatedly resetting the dryer or router will not repair the module.

Further diagnosis and module replacement may then be necessary.

When to Call a Professional Technician

Professional diagnosis may be appropriate when:

nE repeatedly appears during Test Mode.
Router has been checked or reset.
Home Wi-Fi is working normally.
Dryer still cannot communicate correctly.
Wi-Fi module requires inspection.
Wi-Fi module replacement may be necessary.

The correct replacement module should be selected using the complete LG dryer model number.

Key Point

nE means Modem Is Abnormal Error.

It indicates a communication problem between the customer’s router and the dryer’s Wi-Fi module, and LG’s diagnostic reference states that the code only appears in Test Mode.

The primary troubleshooting sequence is:

Check/reset router → Test communication again → Check Wi-Fi module → Replace Wi-Fi module if defective

Do not treat nE as a heating, airflow, motor, or Main PCB error without additional evidence.

nF — Wi-Fi Is Not Connected to Router (Not an Error)

The nF code on an LG dryer means that the appliance is not connected to a Wi-Fi router and has not been registered.

Importantly, nF is not an error code. It is an informational status that may appear during Test Mode when the dryer has not yet been connected to the customer’s Wi-Fi network.

What Does the nF Code Mean?

On compatible LG smart dryers, the Wi-Fi module allows the appliance to communicate with the home network and LG ThinQ services.

If the appliance has not been connected to a router and registered, Test Mode may display:

nF — Wi-Fi Is Not Connected to Router

This does not indicate a failed dryer component.

Instead, it means the dryer has not completed the Wi-Fi connection and registration process.

Is nF an Error Code?

No.

LG’s diagnostic information specifically identifies nF as:

Not an Error Code

The condition simply indicates that the appliance:

Has not been connected to the router
Has not been registered

Therefore, do not replace components simply because nF appears.

nF Appears Only in Test Mode

Another important characteristic of nF is that it:

Only shows during Test Mode.

A technician may therefore encounter nF while performing diagnostic testing even when the dryer is otherwise operating normally.

If the customer does not use the dryer’s Wi-Fi or LG ThinQ features, the presence of nF during Test Mode does not by itself indicate a dryer malfunction.

How to Clear the nF Status

To resolve nF, the dryer needs to be connected to the home’s Wi-Fi network and registered through the LG ThinQ app.

The basic process is:

Install the LG ThinQ app.
Register or sign in to an LG ThinQ account.
Select the appropriate connection method.
Connect the dryer to the Wi-Fi network using the available QR-code setup or manual connection method.
Complete appliance registration.

Once the appliance has been properly connected and registered, the nF condition should no longer represent an unregistered network state.

Connect the Dryer Using LG ThinQ

LG ThinQ is used to connect compatible LG appliances to the customer’s wireless network.

Depending on the dryer and app version, setup may allow:

QR-code connection

Manual Wi-Fi connection

Follow the instructions shown in LG ThinQ for the specific appliance.

Does nF Mean the Wi-Fi Module Is Bad?

No.

This is an important distinction.

nF indicates that the dryer has not been connected and registered. It does not, by itself, identify a defective Wi-Fi module.

Do not replace the Wi-Fi module based solely on an nF display.

If the dryer cannot connect despite correct network setup, then additional troubleshooting may be required—but that is different from the meaning of nF itself.

nF vs. nE

Although both codes involve Wi-Fi connectivity, they mean different things.

nF — Wi-Fi Is Not Connected to Router
Not an error. The appliance has not been connected and registered.

nE — Modem Is Abnormal Error
Indicates an abnormal communication condition involving the router and dryer Wi-Fi module.

Therefore:

nF → Not connected / not registered

nE → Communication abnormality

This distinction can prevent unnecessary replacement of the Wi-Fi module.

nF vs. nC

These codes also relate to different communication systems:

nF → Wi-Fi connection/registration status

nC → NFC Module Error

nC represents an actual NFC module fault, while nF is simply an informational Wi-Fi status.

Does nF Affect Normal Drying?

nF does not indicate a failure of the dryer’s primary drying systems.

It is unrelated to faults involving the:

Heating system
Drum motor
Heat pump
Thermistors
Moisture sensors
Exhaust duct
Door system

If the dryer has a separate operational problem, that issue should be diagnosed independently.

Do You Need to Connect the Dryer to Wi-Fi?

If you want to use compatible LG ThinQ connected features, the dryer needs to be connected to the appropriate Wi-Fi network and registered.

However, the presence of nF during Test Mode should not be interpreted as evidence that a mechanical or heating repair is required.

Can You Reset nF by Unplugging the Dryer?

A power reset does not complete Wi-Fi registration.

Because nF describes the dryer’s network-registration state, the proper solution is:

Connect the appliance to Wi-Fi → Register it through LG ThinQ

rather than repeatedly disconnecting power.

What You Can Check

If you want to connect the dryer:

Confirm that the home Wi-Fi network is available.
Install or open LG ThinQ.
Sign in to the app.
Add the dryer.
Follow the app’s Wi-Fi connection instructions.
Complete appliance registration.

If connection repeatedly fails despite correct setup, network or appliance communication troubleshooting may then be necessary.

When Is Professional Service Needed?

nF alone normally does not indicate that professional dryer repair is required.

Service may be appropriate only if there is an additional problem—for example, the dryer repeatedly fails to connect despite correct network configuration or another actual error code is present.

Do not schedule a mechanical repair solely because nF appears during Test Mode.

Key Point

nF means Wi-Fi Is Not Connected to Router.

It is not an error code. It indicates that the dryer has not been connected to the customer’s router and registered, and it only appears during Test Mode.

The appropriate action is:

Connect dryer to Wi-Fi → Register/sign in through LG ThinQ → Complete appliance registration

Do not replace the Wi-Fi module, Main PCB, or other dryer components based on nF alone.

nP — Power Supply Voltage Error

The nP error code on an LG dryer indicates a Power Supply Voltage Error.

This code appears when the dryer detects that the incoming electrical supply is outside the expected range.

The problem may originate from the home’s electrical system, the dryer power connection, or—in some cases—an internal electrical condition that causes the supply voltage to drop while the dryer is operating.

What Does the nP Error Code Mean?

LG dryers require the correct supply voltage to operate properly.

Depending on the model, the dryer may require:

120 VAC
208 VAC
240 VAC

The required voltage should always be confirmed using the specification label on the dryer.

If the incoming voltage is incorrect or becomes unstable while the dryer is operating, the control may display:

nP — Power Supply Voltage Error.

Common Causes of the nP Error

Possible causes include:

Incorrect supply voltage
Temporary power failure
Voltage drop under load
Excessively high supply voltage
Receptacle problem
Circuit breaker problem
Household wiring problem
Incorrect terminal block connection
Loose or damaged electrical connections
Internal electrical short affecting supply voltage

The power source should be verified before replacing dryer components.

Check the Dryer Power Source

If the dryer will not power on or displays nP, start by checking the electrical supply.

Confirm:

The dryer is receiving power.
The circuit breaker has not tripped.
The receptacle is functioning correctly.
The required voltage matches the dryer specification label.
The dryer power connection is properly installed.

Do not assume that every LG dryer requires the same supply voltage.

Check Voltage While the Dryer Is Running

A receptacle can show apparently correct voltage when the dryer is idle but experience a significant voltage change when the appliance begins operating.

For this reason, the diagnostic reference instructs technicians to check the customer’s voltage while powering the dryer on and attempting to run a cycle.

This helps identify electrical problems that appear only when the circuit is under load.

Voltage More Than 10% Outside the Required Range

The source uses approximately 10% deviation as an important diagnostic threshold.

If the supply voltage drops by more than approximately 10% under load, the customer’s electrical system may be responsible.

Voltage that rises more than approximately 10% above the expected supply can also trigger the error.

For example, a dryer designed for a nominal voltage should receive a supply reasonably close to that specification during actual operation.

Check the Receptacle and Circuit Breaker

If the incoming voltage is incorrect or unstable, the problem may be outside the dryer.

Potential areas include:

Receptacle → Circuit breaker → Household wiring → Electrical service

The source states that when the customer’s electrical system is responsible, an electrician may be needed to repair the receptacle, breaker, or household wiring.

Check Voltage at the Main PCB

The source also directs technicians to verify the power supply:

At the outlet → At the Main PCB

This distinction is important.

Correct voltage at the receptacle does not necessarily prove that the Main PCB is receiving the correct supply.

A problem with the power cord, terminal block, wiring, or connections inside the dryer can interrupt or reduce the voltage before it reaches the control.

Inspect the Terminal Block

The dryer’s terminal block should be inspected when diagnosing nP.

Check for:

Loose connections
Incorrect wiring
Burned terminals
Heat damage
Damaged wires
Improper installation

The source specifically warns that an incorrect terminal-block or switch-wire connection can damage the dryer.

A Power Failure Can Trigger nP

A temporary interruption in household electricity can also be relevant.

If nP appeared around the same time as:

Power outage
Electrical service interruption
Breaker trip
Electrical work in the home

check the supply before investigating internal dryer components.

If the electrical supply returns to normal and the code does not return, component replacement may not be necessary.

Internal Heater Wiring Can Also Cause nP

There is an important less-common cause identified by the diagnostic reference.

In rare cases, a heater wire can temporarily short to ground.

This can produce a voltage drop reaching the Main PCB and cause the dryer to display:

and potentially related power errors such as:

PS or PF.

Inspect Heater Wiring for a Short to Ground

If the household supply and dryer power connections test correctly but nP continues, the heater wiring may require inspection.

The source shows an example where a wire contacts a sharp edge of the heater housing, creating a direct short to ground.

Inspect the heater area for:

Wire contacting metal heater housing
Damaged insulation
Loose heater wiring
Incorrectly routed wires
Signs of arcing or overheating
Heating element or wiring contacting ground

Any wiring found in contact with the heater housing should be corrected according to the model-specific service procedure.

Does nP Automatically Mean the Main PCB Is Bad?

No.

The Main PCB should not be the first component replaced simply because nP appears.

The primary diagnostic path is:

Incoming power → Voltage under load → Receptacle/breaker → Terminal block → Dryer wiring → Main PCB supply

If the supply voltage reaching the dryer is incorrect, replacing the Main PCB will not correct the underlying electrical problem.

nP vs. PF vs. PS

These codes are related to electrical supply conditions, but they should remain separate entries in our LG Dryer Error Codes guide.

The nP reference specifically identifies:

nP — Power Supply Voltage Error

The source also notes that an internal heater-wire short can potentially cause:

nP / PS / PF

because the short may cause the voltage reaching the Main PCB to drop.

We should still verify PF and PS individually because their exact definitions and diagnostic procedures may differ.

Is nP a Heating Error?

Not primarily.

nP is a power-supply voltage error.

However, the heating system can sometimes contribute indirectly if heater wiring shorts to ground and causes the voltage to drop.

Therefore, the distinction is:

Primary meaning → Electrical supply problem

Possible internal cause → Heater circuit short affecting supply voltage

What You Can Check Safely

Before electrical testing:

Check whether there has been a recent power outage.
Check the dryer circuit breaker.
Confirm that the dryer is connected to the correct power source.
Record the complete dryer model number.
Check the specification label for the required supply voltage.

Do not perform live-voltage measurements or internal electrical testing unless you are qualified to work on high-voltage appliance circuits.

When to Call an Electrician

An electrician may be appropriate when:

Supply voltage is incorrect at the receptacle.
Voltage drops significantly when the dryer starts.
Voltage is excessively high.
Breaker or receptacle is damaged.
Household wiring is suspected.
Dryer circuit has an electrical supply problem.

This is especially important because the underlying problem may be in the home rather than the appliance.

When to Call an Appliance Technician

An appliance technician may be needed when:

Correct voltage is available at the receptacle but nP continues.
Terminal block requires inspection.
Internal dryer wiring requires diagnosis.
Heater wiring may be shorting to ground.
Correct voltage needs to be verified at the Main PCB.
Internal electrical components require testing.

Determining whether the fault is house-side or appliance-side is a key part of diagnosing nP.

Key Point

nP means Power Supply Voltage Error.

The dryer is detecting an incorrect electrical supply. Depending on the model, the required supply may be 120 VAC, 208 VAC, or 240 VAC, so always check the dryer’s specification label.

The primary diagnostic sequence is:

Check required voltage → Check outlet → Test voltage under load → Check breaker/receptacle → Check terminal block and wiring → Verify supply at Main PCB

A voltage change of more than approximately 10% can trigger the error. In rare cases, a heater wire shorting against the heater housing can also cause a voltage drop and produce nP, PS, or PF.

nU — NFC Module Error

The nU error code on an LG dryer indicates an NFC Module Error.

This code is associated with the dryer’s NFC (Near Field Communication) module. It indicates that the dryer has detected an abnormal electrical condition involving the NFC module.

According to the diagnostic reference, the specific condition is:

NFC module open or shorted.

The source also states that nU is displayed only in Test Mode.

What Does the nU Error Code Mean?

On applicable LG dryers, the NFC module is part of the appliance’s electronic communication system.

If the NFC module develops an electrical open or short circuit, the dryer can detect the abnormal condition during diagnostic testing and display:

nU — NFC Module Error

This code does not indicate a problem with the dryer’s heating, airflow, drum motor, or temperature-sensing systems.

nU Appears Only in Test Mode

An important characteristic of nU is that it is not a normal operating-cycle error.

The diagnostic reference specifically states:

nC or nU is displayed only in Test Mode.

This means nU may be encountered by a technician during diagnostic testing even though the dryer did not display the code during normal use.

What Causes the nU Error?

The source identifies the cause as an NFC module that is:

Electrically open
Electrically shorted

An open circuit means the expected electrical path through the module has been interrupted.

A short circuit means an abnormal electrical path exists within the module or its circuit.

Either condition prevents the NFC module from operating normally.

Check the NFC Module

If nU appears during Test Mode, troubleshooting should focus on the NFC module and its associated electrical connections.

Before component replacement, it is reasonable to inspect the system for obvious connection problems, including:

Loose NFC module connector
Damaged wiring
Damaged terminals
Poor electrical connection
Visible module damage

The complete dryer model number should be confirmed before ordering replacement components.

Does nU Mean the Main PCB Is Bad?

No.

The direct diagnostic reference does not identify the Main PCB as the prescribed repair for nU.

It specifically identifies:

Cause → NFC module open or shorted

and gives the solution:

Replace NFC module.

Therefore, the Main PCB should not be replaced based solely on an nU code.

Is nU a Wi-Fi Error?

No.

Although NFC and Wi-Fi are both communication technologies, they are separate systems.

In the codes we have already covered:

nU → NFC Module Error

nC → NFC Module Error

nE → Modem Is Abnormal Error

nF → Wi-Fi Is Not Connected to Router (Not an Error)

So an nU code should not automatically lead to troubleshooting the customer’s Wi-Fi router or internet connection.

Is nU a Heating or Airflow Error?

No.

nU does not indicate a failure involving:

Heating element
Gas burner
Heat-pump compressor
Thermistor
Moisture sensor
Drum motor
Exhaust duct
Flow Sense system

If the dryer has a separate problem such as no heat or poor drying performance, that symptom should be diagnosed independently.

nU vs. nC

For LG dryers, the direct diagnostic references give nU and nC the same basic fault description:

NFC Module Error

The source for nU even states that:

nC or nU is displayed only in Test Mode.

Therefore, both codes point toward an open or shorted NFC module.

However, keeping separate nC and nU entries in an error-code guide is still useful because users may search for either code exactly as it appears during diagnostics.

Does nU Automatically Mean the NFC Module Must Be Replaced?

The source’s prescribed solution is:

Replace NFC module.

For practical diagnosis, however, the module and its connections should be correctly identified for the exact dryer model before replacement.

A visibly loose or damaged connection should not be ignored.

Can You Clear nU by Resetting the Dryer?

A power reset may remove a displayed diagnostic message temporarily, but it cannot repair an NFC module that is electrically open or shorted.

If the underlying condition remains, Test Mode can detect the problem again.

Therefore, repeated resets are not a substitute for correcting the NFC module fault.

Does nU Affect Normal Dryer Operation?

Because nU concerns the NFC communication system and is displayed only during Test Mode, it should not automatically be assumed to explain an unrelated drying complaint.

If the dryer:

Does not heat
Does not tumble
Takes too long to dry
Overheats
Has an airflow problem

those symptoms should be investigated using their relevant diagnostic systems and error codes.

Why the Exact Model Number Matters

Before replacing the NFC module, confirm:

Complete LG dryer model number
Whether the model uses the applicable NFC system
Correct NFC module part
Module connector configuration
Model-specific service information

This helps ensure that the correct communication component is being diagnosed.

When to Call a Professional Technician

Professional diagnosis may be appropriate when:

nU appears during Test Mode.
NFC module connections require inspection.
An open or short circuit needs to be confirmed.
NFC module replacement is required.
The correct module cannot be identified.

The repair should be matched to the exact LG dryer model.

Key Point

nU means NFC Module Error.

According to the LG diagnostic reference:

Cause → NFC module open or shorted

Display condition → nC or nU appears only in Test Mode

Solution → Replace NFC module.

Do not interpret nU as a heating, airflow, motor, Wi-Fi router, or power-supply error.

OE — Drain Pump Error

The OE error code on an LG dryer indicates a Drain Pump Error.

This code applies to dryer models equipped with a system that collects and drains condensed water. The error occurs when the dryer detects that the water level is not dropping after the drain pump has operated.

An OE code does not automatically mean that the drain pump itself has failed. A restricted drain hose or lint buildup around the pump impeller can prevent proper drainage and produce the same condition.

What Does the OE Error Code Mean?

During operation, applicable LG dryers collect moisture removed from clothing as condensed water.

The drainage system must then remove this water. When the drain pump operates, the control expects the detected water level to decrease.

If the water level does not drop as expected after the pump has run, the dryer may display:

OE — Drain Pump Error

The diagnostic process should therefore focus on why water is not being removed correctly.

Common Causes of the OE Error

The main areas to check are:

Kinked drain hose
Clogged drain hose
Lint buildup around the drain pump impeller
Drain pump not receiving voltage
Drain pump unable to operate normally

These possibilities should be investigated before assuming that the pump needs replacement.

Check the Drain Hose First

The first step is to inspect the drain hose.

Look for:

Sharp bends
Kinks
Pinched sections
Internal blockage
Lint or debris
Improper hose routing

A restricted hose can prevent water from leaving the dryer even when the drain pump is operating normally.

Straighten any kinked sections and remove accessible blockages before testing the dryer again.

Why a Kinked Hose Can Trigger OE

The control does not simply need to know that the pump has been activated. It expects the water level to decrease after pumping.

If the drain hose is blocked, the pump may operate while water remains inside the drainage system.

The result can still be an OE error because the expected decrease in water level does not occur.

Check for a Clogged Drain Hose

If the hose is not visibly kinked, inspect it for an internal obstruction.

Lint, debris, or accumulated residue can reduce or completely block water flow.

A partial restriction may also create intermittent symptoms—for example, the dryer may drain slowly during some cycles but eventually display OE when the required water-level change does not occur.

Check the Drain Pump Impeller

If the drain hose is clear, the next area identified by the diagnostic reference is the drain pump impeller.

The source specifically recommends checking the pump for:

Possible lint buildup on the impeller.

Lint or debris around the impeller can prevent the pump from moving water efficiently.

Inspect the Pump for Lint Buildup

With the dryer disconnected from power, the pump area may need to be inspected for accumulated debris.

Look for material that could:

Restrict impeller movement
Prevent normal rotation
Reduce pump performance
Block the pump inlet or outlet

If lint is physically preventing the impeller from operating, removing the obstruction may restore normal drainage without replacing the pump.

Does OE Automatically Mean the Drain Pump Is Bad?

No.

OE describes the result detected by the dryer:

Water level is not dropping after the pump has run.

It does not identify the drain pump as the failed component by itself.

The correct diagnostic sequence is:

Drain hose → Pump impeller → Pump electrical supply → Pump condition

This helps avoid replacing a functional pump when the actual problem is a blocked drainage path.

Check Voltage to the Drain Pump

If the drainage path and pump impeller are clear, the diagnostic reference instructs technicians to:

Check the pump for voltage.

This helps distinguish between two basic conditions:

Pump receives the expected electrical supply but does not operate correctly
→ The pump itself becomes a stronger suspect.

Pump does not receive the expected electrical supply
→ Wiring or control diagnosis may be necessary.

Do Not Guess the Pump Voltage

The direct OE reference does not provide a universal voltage specification for the drain pump.

For this reason, the expected voltage should be determined using service information for the exact LG dryer model rather than applying a value from another dryer or another error code.

Check the Pump Wiring

If the pump is not operating normally, inspect its electrical circuit.

Check for:

Loose pump connector
Disconnected wiring
Damaged terminals
Broken wires
Corrosion
Heat damage
Poor electrical contact

A functional pump cannot operate if its electrical supply is interrupted before reaching the motor.

OE vs. drn

We previously covered another LG dryer code associated with drainage:

drn — Drain Pump Error

The drn reference also describes a condition where the water level fails to decrease after pump operation.

However, LG uses different diagnostic messages across dryer models and configurations.

For this guide, it is useful to keep:

OE — Drain Pump Error

and

drn — Drain Pump Error

as separate searchable entries rather than assuming that the two codes are universally interchangeable.

OE vs. E13

We also have:

E13 — Drain Pump Error

But its direct reference provides a somewhat different diagnostic emphasis, including drain-line blockage and specific electrical testing of the pump.

Therefore, our LG Dryer Error Codes guide should retain all three:

drn — Drain Pump Error
E13 — Drain Pump Error
OE — Drain Pump Error

The displayed code depends on the dryer design and diagnostic system.

Is OE an Exhaust Airflow Error?

No.

Do not confuse drainage with dryer exhaust airflow.

OE → Condensate drainage problem

d80 / d85 / d90 / d95 → Exhaust duct restriction

An OE code directs troubleshooting toward the water drainage system, not the home’s dryer vent.

Is OE a Heating Error?

No.

OE does not directly identify a failure involving:

Heating element
Gas burner
Compressor
Thermistor
Heating control

The error is generated because the dryer is not detecting the expected decrease in water level after drain-pump operation.

If the dryer also has a heating problem, that symptom should be diagnosed separately.

Can You Clear the OE Error?

If OE is caused by a kinked or clogged drain hose, correcting the restriction may allow the dryer to drain normally again.

A basic sequence is:

Turn the dryer off.
Disconnect power.
Inspect the drain hose.
Remove any kink or accessible blockage.
Check the pump area for lint buildup if accessible.
Restore power.
Run the dryer and check whether OE returns.

If the error returns, electrical diagnosis of the drain pump may be required.

What You Can Check Before Service

Before calling for repair, check:

Whether the drain hose is kinked.
Whether the hose is visibly blocked.
Whether the hose has been crushed behind the appliance.
Whether the drainage path has recently been moved or changed.
Whether OE returns after correcting the hose.

Internal pump inspection and electrical testing require greater disassembly and should be performed with the dryer disconnected from power.

When to Call a Professional Technician

Professional diagnosis may be appropriate when:

OE repeatedly returns.
Drain hose is clear and correctly routed.
Pump impeller may be obstructed.
Drain pump does not operate.
Pump voltage requires testing.
Internal wiring requires inspection.
Drain pump replacement may be necessary.

The technician should use the complete dryer model number to determine the correct pump configuration and electrical specifications.

Key Point

OE means Drain Pump Error.

The dryer has detected that the water level is not dropping after the drain pump has run.

The source gives a clear troubleshooting sequence:

Check drain hose for kink or clog → Check drain pump impeller for lint buildup → Check voltage to the drain pump.

Do not replace the drain pump based on OE alone. A simple hose restriction or debris around the impeller can prevent proper drainage even when the pump itself is functional.

PF — Power Supply Voltage Error

The PF error code on an LG dryer indicates a Power Supply Voltage Error.

This code appears when the dryer detects that the incoming electrical supply is not correct. It may also appear after a power interruption or when the supply voltage changes significantly while the dryer is attempting to operate.

Depending on the model, an LG dryer may require 120 VAC, 208 VAC, or 240 VAC, so the correct voltage should always be confirmed using the specification label on the appliance.

What Does the PF Error Code Mean?

PF indicates that the dryer has detected an abnormal power-supply condition.

Possible conditions include:

Power failure to the outlet
Incorrect incoming voltage
Voltage dropping under load
Excessively high supply voltage
Receptacle or circuit breaker problem
Household wiring problem
Incorrect terminal block connection
Internal wiring problem affecting the power supply

The electrical supply should be checked before replacing dryer components.

Check for a Recent Power Failure

The source specifically identifies a possible:

Power failure to the outlet

as a cause of PF.

If the code appeared after:

A household power outage
A breaker trip
Electrical service interruption
Work on the home’s electrical system

the event may be related to the PF code.

If normal power has been restored and the code does not return, component replacement may not be necessary.

Check the Required Supply Voltage

LG dryer electrical requirements vary by model.

The diagnostic reference notes that some units require:

120 VAC

while others require:

208 VAC or 240 VAC.

Always check the dryer’s specification label before determining whether the measured voltage is correct.

Do not assume that every LG dryer requires 240 VAC.

Check the Power Source

If the dryer will not power up, start with the power source.

Check:

Circuit breaker
Dryer receptacle
Power cord
Electrical connection
Required supply voltage

If the outlet is not providing the correct power, the problem may be with the home’s electrical system rather than the dryer.

Check Voltage While Starting a Cycle

The source specifically instructs technicians to check the customer’s voltage while powering the dryer on and attempting to run a cycle.

This is important because voltage may appear normal when the dryer is idle but change significantly when the appliance is placed under load.

A load test can therefore reveal an electrical problem that a simple unloaded voltage measurement may miss.

Voltage Changes Can Trigger PF

According to the diagnostic reference, a significant voltage deviation can trigger the code.

The source uses approximately 10% as the relevant threshold and notes that excessively high voltage can also cause the error.

Therefore, diagnosis should consider both:

Voltage drop

and

Excessively high voltage.

Check the Receptacle, Breaker, and Household Wiring

If the voltage supplied to the dryer is incorrect, the problem may be outside the appliance.

Possible areas include:

Receptacle → Circuit breaker → Household wiring

The source recommends an electrician when the customer’s electrical system is responsible for the abnormal supply condition.

Verify Power at the Outlet and Main PCB

The diagnostic reference instructs technicians to verify the power source at two important locations:

At the outlet

and

At the Main PCB.

This helps determine where the abnormal voltage is occurring.

For example:

Incorrect voltage at outlet
→ Investigate the home’s electrical supply.

Correct voltage at outlet but incorrect voltage reaching the dryer electronics
→ Investigate the dryer power connection and internal wiring.

Check the Terminal Block

The terminal block and associated wiring should also be inspected.

Look for:

Loose connections
Incorrect wiring
Burned terminals
Heat damage
Damaged conductors
Improperly installed wires

The source specifically warns that an incorrect terminal block or switch-wire connection may damage the dryer.

Rare Cause — Heater Wire Short to Ground

The reference identifies another important but less common cause.

A heater wire can temporarily short to ground, causing the voltage reaching the Main PCB to drop.

According to the source, this condition can potentially trigger:

nP, PS, or PF.

One example shown in the diagnostic information involves a wire contacting a sharp edge of the heater housing, producing a direct short to ground.

Inspect the Heater Wiring

If the home’s electrical supply is correct but PF continues to return, internal heater wiring may require inspection.

Check for:

Damaged wire insulation
Heater wire touching metal housing
Incorrect wire routing
Pinched wiring
Signs of arcing
Burned connections
Wire contacting a sharp metal edge

Any short-to-ground condition must be corrected before the dryer is returned to service.

Does PF Automatically Mean the Main PCB Is Bad?

No.

PF indicates a power-supply voltage problem. It does not prove that the Main PCB has failed.

A more appropriate diagnostic sequence is:

Power source → Voltage under load → Receptacle/breaker → Terminal block → Internal wiring → Voltage at Main PCB

Replacing the Main PCB will not solve an incorrect household supply or damaged power connection.

PF vs. nP

For the direct references we have checked, PF and nP are both identified as:

Power Supply Voltage Error

and their diagnostic information is essentially the same.

Therefore, both codes may direct troubleshooting toward the same electrical supply areas.

However, keeping separate entries for:

nP — Power Supply Voltage Error

and

PF — Power Supply Voltage Error

is useful because users may search for the exact code displayed by their dryer.

PF vs. PS

The PF reference also mentions PS in connection with voltage problems and a possible heater-wire short.

However, we should keep PS as a separate accordion entry and verify its direct page before assigning its exact definition.

Is PF a Heating Error?

Not primarily.

PF indicates a power supply voltage problem, not a heating-system failure.

However, heater wiring can occasionally be involved if a wire shorts to ground and causes the supply voltage reaching the Main PCB to drop.

Therefore:

Primary meaning → Power supply voltage problem

Possible internal cause → Heater wiring short to ground

What You Can Check Safely

Before internal diagnosis:

Check whether there was a recent power outage.
Check the dryer circuit breaker.
Confirm that the dryer has power.
Record the complete model number.
Check the specification label for the required supply voltage.
If the code returns, have the electrical supply properly tested.

Live electrical measurements should only be performed by someone qualified to work with appliance line voltage.

When to Call an Electrician

An electrician may be needed when:

Outlet voltage is incorrect.
Voltage changes significantly when the dryer starts.
Voltage is excessively high.
Breaker or receptacle is damaged.
Household wiring is suspected.

In these cases, repairing the dryer itself will not correct the underlying problem.

When to Call an Appliance Technician

An appliance technician may be appropriate when:

Correct voltage is present at the outlet but PF continues.
Terminal block requires inspection.
Internal wiring requires diagnosis.
Heater wiring may be shorting to ground.
Voltage needs to be verified at the Main PCB.
The dryer has signs of electrical damage.

Key Point

PF means Power Supply Voltage Error.

Start by checking whether there was a power interruption and confirming the voltage required by the dryer’s specification label. Depending on the model, the required supply may be 120 VAC, 208 VAC, or 240 VAC.

The diagnostic path is:

Check power source → Check voltage under load → Check receptacle/breaker → Check terminal block → Verify voltage at Main PCB → Inspect internal wiring if necessary

The source also identifies a rare condition where a heater wire shorts to ground, causing voltage to drop at the Main PCB and potentially producing nP, PS, or PF.

PS — Power Supply Voltage Error

The PS error code on an LG dryer indicates a Power Supply Voltage Error.

This code appears when the dryer detects that the incoming electrical supply is not correct. The problem may be caused by an interruption in household power, incorrect supply voltage, a voltage change when the dryer starts, an electrical connection problem, or—in some cases—an internal wiring fault.

Depending on the dryer model, the required supply may be 120 VAC, 208 VAC, or 240 VAC. Always check the specification label on the appliance before evaluating the power supply.

What Does the PS Error Code Mean?

The dryer requires a stable electrical supply within the expected operating range.

If the voltage is incorrect, the control may display:

PS — Power Supply Voltage Error

The diagnostic reference identifies two basic conditions to consider:

The supply voltage is incorrect.
There may have been a power failure to the outlet.

This means PS should first be treated as a power-supply problem, not as evidence that the Main PCB or heating system has failed.

Check for a Power Failure

If PS appeared unexpectedly, determine whether there was a recent:

Power outage
Breaker trip
Electrical service interruption
Temporary loss of power to the dryer
Electrical work in the home

A temporary power interruption can be relevant to the code.

If normal power is restored and PS does not return, component replacement may not be necessary.

Check the Required Dryer Voltage

Not every LG dryer uses the same electrical supply.

According to the diagnostic reference, depending on the model, the appliance may require:

120 VAC

or:

208 / 240 VAC.

The correct requirement should be taken from the dryer specification label.

Do not assume that a dryer requires 240 VAC simply because it is an electric clothes dryer.

Check the Power Source

If the dryer will not power on or PS continues to appear, check the incoming electrical supply.

The initial inspection should include:

Dryer receptacle
Circuit breaker
Power cord
Electrical connection
Required supply voltage

If the receptacle is not supplying the correct voltage, the dryer itself may not be the source of the problem.

Check Voltage While Starting the Dryer

The diagnostic reference specifically instructs technicians to measure the customer’s voltage while powering the dryer on and attempting to run a cycle.

This is important because the voltage may appear normal while the dryer is idle but change when the appliance begins drawing power.

Therefore, checking voltage only with the dryer turned off may not reveal the actual problem.

Watch for Significant Voltage Changes

The source identifies a voltage deviation of approximately 10% as important when diagnosing this condition.

It states that a voltage drop associated with the customer’s electrical system can cause the error, while voltage that is too high by more than approximately 10% may also trigger it.

In either case, the electrical supply should be corrected before replacing appliance components.

When an Electrician May Be Needed

If the incoming voltage is incorrect, the diagnostic reference directs attention toward the home’s:

Receptacle → Breaker → Electrical wiring

An electrician may be required to repair the electrical supply.

This distinction is important because replacing dryer components cannot correct an inadequate or unstable household electrical circuit.

Verify Voltage at the Outlet and Main PCB

If the power source appears normal, diagnosis should determine whether the correct voltage actually reaches the dryer’s electronics.

The source specifically instructs technicians to verify the power source:

At the outlet

and:

At the Main PCB.

This helps determine whether the problem originates outside or inside the appliance.

Check the Terminal Block

The terminal block and its wiring should also be inspected.

Look for:

Loose terminals
Incorrect wire connections
Burned connections
Damaged wires
Signs of overheating
Improper installation

The diagnostic reference warns that an incorrect terminal block or switch-wire connection can damage the dryer.

Rare Cause — Heater Wire Short to Ground

The source identifies an important less-common cause of PS.

A heater wire can temporarily short to ground, causing the voltage reaching the Main PCB to drop.

According to the reference, this condition may produce:

nP, PS, or PF

depending on the dryer and circumstances.

Inspect the Heater Wiring

The example provided by the source shows a white wire touching a sharp edge of the heater housing, producing a direct short to ground.

If household voltage is correct but PS continues, inspect the heater wiring for:

Damaged insulation
Wire contacting the heater housing
Wire resting against a sharp metal edge
Pinched wiring
Burned or overheated connections
Signs of electrical arcing

Any damaged or incorrectly routed wiring should be corrected before operating the dryer.

Does PS Automatically Mean the Main PCB Is Bad?

No.

PS identifies an abnormal power-supply condition. It does not prove that the Main PCB has failed.

A better diagnostic sequence is:

Required voltage → Outlet → Voltage under load → Breaker/receptacle → Terminal block → Internal wiring → Main PCB supply

The Main PCB should not be replaced before the incoming electrical supply and power path have been verified.

PS vs. nP vs. PF

We have now verified all three direct pages:

nP — Power Supply Voltage Error
PF — Power Supply Voltage Error
PS — Power Supply Voltage Error

The source material for these codes is essentially the same and even specifically mentions that a heater-wire short can produce nP, PS, or PF.

For the Error Codes page, however, keeping all three entries is useful because an owner may search for the exact code displayed by their dryer.

Is PS a Heating Error?

Not primarily.

PS indicates an electrical supply problem.

However, the heating system can sometimes be indirectly responsible if heater wiring shorts against the metal housing and causes a voltage drop.

So the distinction is:

Primary meaning → Power Supply Voltage Error

Possible internal cause → Heater wiring short to ground

What You Can Check Safely

Before internal electrical testing:

Check whether the home recently lost power.
Check the dryer circuit breaker.
Confirm that the dryer is connected to its proper electrical supply.
Record the complete dryer model number.
Check the specification label for the required voltage.

Testing live 120–240 VAC circuits should be left to someone qualified to work with appliance line voltage.

When to Call an Electrician

An electrician may be needed when:

Voltage at the receptacle is incorrect.
Voltage changes significantly when the dryer starts.
Supply voltage is excessively high.
Circuit breaker or receptacle is damaged.
Household wiring is suspected.

In these situations, the electrical system should be corrected before dryer components are replaced.

When to Call an Appliance Technician

An appliance technician may be appropriate when:

Correct voltage is present at the outlet but PS continues.
Terminal block requires inspection.
Internal dryer wiring needs diagnosis.
Heater wiring may be shorting to ground.
Voltage at the Main PCB requires testing.
Internal electrical damage is suspected.

Key Point

PS means Power Supply Voltage Error.

Depending on the model, the dryer may require 120 VAC, 208 VAC, or 240 VAC, so start by checking the appliance specification label and verifying the incoming supply.

The diagnostic sequence is:

Check required voltage → Check outlet → Measure voltage while starting a cycle → Check breaker/receptacle → Inspect terminal block → Verify power at Main PCB → Inspect internal wiring

The source also identifies a rare but important condition where a heater wire shorts to the heater housing, causing voltage to drop and potentially triggering nP, PS, or PF.

tE1 — Thermistor Error

The tE1 error code on an LG dryer indicates a Thermistor Error.

The code is associated with the temperature sensor located on the blower housing. The Main PCB displays tE1 when it detects an open or short circuit in the thermistor circuit.

The problem may involve the thermistor itself, its wiring or connectors, or the signal reaching the Main PCB.

What Does the tE1 Error Code Mean?

The thermistor monitors temperature inside the dryer and sends temperature information to the Main PCB.

The control uses this information to regulate dryer operation and heating.

If the thermistor signal becomes electrically open or shorted, the Main PCB may no longer receive a valid temperature reading and can display:

tE1 — Thermistor Error

The diagnostic reference also describes the general cause as a temperature sensor failure or a significant difference between the actual and sensed temperature.

Where Is the tE1 Thermistor Located?

For this code, the relevant thermistor is located on the:

Blower Housing

This distinction is important because an LG dryer may contain multiple temperature sensors.

When diagnosing tE1, troubleshooting should focus on the thermistor circuit identified for the blower housing rather than automatically testing every temperature sensor in the appliance.

What Causes the tE1 Error?

The main diagnostic possibilities include:

Open thermistor
Shorted thermistor
Incorrect thermistor resistance
Damaged thermistor wiring
Loose or damaged connector
Open or short in the circuit between the thermistor and Main PCB
Main PCB not interpreting an otherwise correct thermistor signal properly

The thermistor should be tested before replacing components.

Check the Thermistor Resistance

The diagnostic reference instructs technicians to measure the resistance of the thermistor and compare the reading with the expected value for the actual temperature.

If the measured resistance does not correspond to the temperature, the thermistor should be replaced.

This is important because thermistors do not simply operate as an ON/OFF switch.

Their resistance changes with temperature.

Therefore:

Measured resistance + Actual temperature → Compare with expected thermistor value

Test the Thermistor From the Main PCB

One of the most useful diagnostic details from the source is that the thermistor should be checked from the Main PCB when the error is present.

This provides a more complete test than checking the sensor by itself.

Measuring from the board allows the technician to evaluate the electrical path through:

Main PCB connector → Wiring harness → Thermistor

If the resistance is incorrect when measured from the Main PCB, the fault may be in either the sensor or the wiring between the sensor and control.

Why Testing From the Main PCB Matters

Suppose the thermistor itself measures correctly when tested directly at the sensor.

That does not necessarily prove that the Main PCB is receiving the same signal.

A damaged wire, loose terminal, poor connector, or intermittent connection between the thermistor and Main PCB can alter or interrupt the circuit.

Testing from the Main PCB therefore helps answer a more useful diagnostic question:

What resistance does the Main PCB actually see?

Check the Wiring Harness

If the thermistor does not measure correctly from the Main PCB, inspect the wiring between the control and blower-housing thermistor.

Look for:

Broken wires
Loose terminals
Partially disconnected connectors
Damaged insulation
Pinched wiring
Corrosion
Heat damage
Poor terminal contact

A wiring fault can produce the same open/short condition that the Main PCB would see from a defective thermistor.

Connector and Wire Colors Can Vary

The source specifically warns that LG dryer configurations vary.

Some models may use an:

8-pin connector

while others may use a:

6-pin connector

at the Main PCB.

At the blower-housing thermistor, there may be two red wires, while the main harness commonly connects through yellow and blue wires.

However, LG specifically notes that wire colors vary by model.

For this reason, do not identify the thermistor circuit solely by wire color.

Use the Model-Specific Wiring Diagram

The correct wiring configuration should be confirmed using the wiring diagram for the exact dryer model.

According to the reference, a copy of the dryer wiring diagram is usually located:

Inside the Main Board cover.

This diagram can help identify:

Thermistor terminals
Main PCB connector
Correct circuit path
Connector pin locations
Model-specific wire colors

Does tE1 Automatically Mean the Thermistor Is Bad?

No.

This is one of the most important points for diagnosing tE1.

The Main PCB is detecting an abnormal thermistor circuit, but the problem can exist anywhere along that circuit.

A better diagnostic sequence is:

Thermistor resistance → Wiring harness → Connectors → Signal measured from Main PCB → Main PCB

Replacing the thermistor without checking what the board actually sees can result in unnecessary parts replacement.

What If the Thermistor Tests Correctly?

If the thermistor resistance is correct when checked from the Main PCB while the error is occurring, the sensor and wiring become less likely causes.

At that point, the Main PCB may require further diagnosis because it is receiving an apparently valid resistance but still reporting an abnormal thermistor condition.

Conversely, if the resistance is incorrect when measured from the Main PCB, the wiring between the board and thermistor should be investigated along with the thermistor itself.

Can Cold Air Cause tE1?

According to the diagnostic reference:

Cold air can cause a tE2 error, but not a tE1 error.

This is an important distinction between the two temperature-related codes.

tE1 specifically points toward the Main PCB detecting an open or short condition in the blower-housing thermistor circuit.

Therefore, a cold dryer or cold ambient conditions should not automatically be blamed for tE1.

tE1 vs. tE2

Although both are thermistor-related codes, they should not be treated as interchangeable.

tE1 → Open/short condition involving the blower-housing thermistor circuit

tE2 → Separate thermistor-related condition that we will verify against its own direct diagnostic page

The direct tE1 reference specifically states that cold air may contribute to tE2 but should not cause tE1.

Is tE1 a Heating Element Error?

No.

tE1 primarily indicates a problem with temperature sensing.

It does not directly mean that the dryer has a failed:

Heating element
Gas valve
Igniter
Heat-pump compressor

However, incorrect temperature information can affect heating behavior because the Main PCB relies on temperature feedback to control dryer operation.

Can You Reset the tE1 Error?

You can power-cycle the dryer, but a reset will not repair an open or shorted thermistor circuit.

If tE1 returns, the underlying sensor circuit should be diagnosed.

Repeatedly resetting the dryer may temporarily remove the displayed code without correcting the actual problem.

What You Can Check First

If tE1 appears:

Record the complete dryer model number.
Turn the dryer off and disconnect power.
Inspect accessible thermistor wiring and connectors.
Check for loose or damaged connections.
Use the model-specific wiring diagram to identify the correct blower-housing thermistor circuit.
If qualified, measure thermistor resistance and compare it with the expected value for the actual temperature.

For the most useful diagnosis, resistance should also be checked from the Main PCB.

When to Call a Professional Technician

Professional diagnosis is recommended when:

tE1 repeatedly returns.
Thermistor resistance requires measurement.
Wiring between the thermistor and Main PCB needs testing.
Connectors require pin-to-pin diagnosis.
Thermistor tests correctly but tE1 remains.
Main PCB requires evaluation.

The exact wiring configuration should always be matched to the dryer model.

Key Point

tE1 means Thermistor Error.

More specifically, the direct diagnostic reference states that tE1 should occur when the Main PCB detects an open or short in the thermistor circuit on the blower housing.

The best diagnostic sequence is:

Check thermistor resistance → Measure from Main PCB → Inspect wiring/connectors → Compare resistance with actual temperature → Evaluate Main PCB if the circuit tests correctly

Also remember:

Cold air may cause tE2, but it should not cause tE1.

tE2 — Dryer Thermistor Out of Range Error

The tE2 error code on an LG dryer indicates a Dryer Thermistor Out of Range Error.

The exact meaning depends on the type of LG dryer.

On a standard electric or gas dryer, tE2 is associated with the dryer temperature thermistor and may occur when the sensor circuit is open or shorted. Extremely cold air entering through the dryer vent can also cause the thermistor to detect an unusually low temperature and trigger tE2.

On an LG heat pump dryer, tE2 is associated with the compressor discharge (outlet) temperature thermistor.

Because the same code can refer to different temperature-sensing systems, always identify the dryer type and complete model number before replacing components.

What Does the tE2 Error Code Mean?

A thermistor is a temperature-sensitive component whose resistance changes as its temperature changes.

The dryer control monitors the thermistor signal to determine whether temperatures are within the expected operating range.

If the sensor produces an abnormal reading, the dryer may display:

tE2 — Dryer Thermistor Out of Range Error

However, the reason for that abnormal reading depends on the dryer configuration.

tE2 on Standard Electric and Gas Dryers

On standard electric and gas LG dryers, the source identifies the primary condition as:

Temperature thermistor is shorted or open.

The thermistor should be tested for proper resistance and compared with the expected value for its actual temperature.

An abnormal reading may indicate a defective sensor, but the sensor circuit and wiring should also be considered before replacing components.

Check the Thermistor Resistance

The thermistor should be evaluated by measuring its resistance and comparing the result with the appropriate temperature/resistance specifications.

Because thermistor resistance changes with temperature, there is not one universal resistance value that applies under all conditions.

The basic diagnostic principle is:

Measure thermistor resistance → Determine actual temperature → Compare with the appropriate resistance specification

If the reading does not correspond to the expected value, the thermistor or its circuit requires further diagnosis.

Cold Weather Can Cause tE2

One of the most important characteristics of tE2 is that it can sometimes appear without an actual failed thermistor.

The diagnostic reference specifically states that cold air entering through the customer’s dryer duct can cause the thermistor to detect a very low temperature and produce tE2.

This is particularly relevant during cold weather when outdoor air enters the dryer through the exhaust system while the appliance is not operating.

Check the Outdoor Dryer Vent

If tE2 appears during very cold weather, inspect the outside dryer vent.

The exterior duct cap may remain open and allow excessive cold outdoor air to enter the dryer.

Check that the exterior vent:

Opens normally when the dryer operates
Closes properly when the dryer is off
Is not stuck open
Is not damaged
Is not being held open by debris

A dryer that becomes extremely cold internally can produce an abnormal thermistor reading even when the sensor itself is functional.

Preheat the Dryer in Very Cold Conditions

For a dryer that has become extremely cold, the source provides a specific warm-up procedure before using Steam Fresh:

Turn on the dryer.
Select the NORMAL cycle.
Press START.
Allow the dryer to run for approximately 5 minutes.
Stop or complete the warm-up.
Select Steam Fresh.
Press More Time twice.
Select the big option.
Begin the cycle.

Preheating the dryer helps prevent tE2 caused by an excessively cold sensor before the Steam Fresh cycle begins.

Steam Sanitary and Air Dry in Low Temperatures

The diagnostic reference also notes that:

Steam Sanitary and Air Dry cannot be used under the described low-temperature condition.

If the dryer has been exposed to very cold outdoor air, warm the appliance before attempting the applicable steam cycle.

Does Cold Weather Mean the Thermistor Is Good?

Not necessarily.

Cold air is one possible explanation for tE2, but the direct diagnostic reference also identifies an open or shorted thermistor as a cause.

A useful diagnostic distinction is:

Very cold dryer + tE2 → Warm dryer and retest

Normal temperature + recurring tE2 → Test thermistor circuit

If the code disappears after the dryer reaches a normal temperature, unnecessary sensor replacement may be avoided.

Thermistor Wiring and Connectors

The source notes that specific models may use either a:

6-pin or 8-pin connector at the Main Board.

At the blower-housing thermistor, the sensor may have two red wires, which commonly connect to yellow and blue wires in the main harness.

However, these details can vary by model.

Do not identify or test a thermistor circuit solely by assumed wire colors.

tE2 on LG Heat Pump Dryers

On heat pump models, tE2 has a different diagnostic meaning.

The relevant component is the:

Compressor Discharge (Outlet) Temperature Thermistor

The source identifies the condition as:

Compressor discharge temperature thermistor is shorted or open.

This thermistor is part of the heat-pump system rather than the conventional blower-housing temperature-sensing configuration.

How to Identify a Heat Pump Dryer

The source provides useful model-number guidance.

A dryer model beginning with:

DLH

is identified as a heat pump dryer.

A WashTower model beginning with:

WKH

also indicates an applicable heat-pump configuration.

The complete model number should still be confirmed before applying heat-pump diagnostic procedures.

Check the Compressor Thermistor

For a heat-pump dryer displaying tE2, troubleshooting should focus on the compressor discharge/outlet thermistor.

The sensor should be checked for proper values according to the specifications for the dryer model.

The diagnostic sequence should include:

Thermistor → Wiring/connectors → Thermistor signal → Control circuit

Do not apply the conventional electric/gas dryer thermistor diagnosis to the heat-pump compressor sensor without first identifying the dryer type.

Does tE2 Automatically Mean the Thermistor Is Bad?

No.

For standard electric/gas models, tE2 can be caused by:

Open thermistor circuit
Shorted thermistor circuit
Abnormally cold sensor temperature
Cold outdoor air entering through the dryer duct

For heat-pump models, diagnosis should focus on the compressor discharge temperature thermistor and its circuit.

The code identifies an abnormal temperature-sensor condition, not automatically a failed sensor.

tE1 vs. tE2

These codes should not be treated as interchangeable.

tE1 — Thermistor Error
Associated with an open or short condition involving the blower-housing thermistor circuit.

tE2 — Thermistor Out of Range Error
Can be caused by an open/short thermistor or extremely cold conditions on conventional dryers, while heat-pump models use tE2 for the compressor discharge temperature thermistor.

One particularly useful distinction from the diagnostic information is:

Cold air can cause tE2, but not tE1.

Is tE2 a Heating Element Error?

No.

tE2 primarily indicates a temperature-sensing problem.

It does not automatically mean that the dryer needs a new:

Heating element
Gas valve
Igniter
Compressor
Main PCB

The temperature-sensing system and environmental conditions should be investigated first.

Can You Clear the tE2 Error?

If tE2 was caused by extremely cold conditions, warming the dryer and correcting excessive cold-air entry through the exhaust vent may resolve the problem.

If the code returns when the dryer is at a normal temperature, the thermistor circuit should be tested.

A simple power reset will not repair an electrically open or shorted sensor.

What You Can Check First

If tE2 appears:

Record the complete dryer model number.
Determine whether the dryer is standard electric/gas or heat pump.
Consider whether the dryer is extremely cold.
Inspect the exterior vent cap for excessive cold-air entry.
Warm a very cold dryer before retesting.
If tE2 returns at normal temperature, proceed with thermistor diagnosis.

For a heat-pump model, make sure the correct compressor discharge thermistor is being tested.

When to Call a Professional Technician

Professional diagnosis is recommended when:

tE2 returns at normal room temperature.
Thermistor resistance requires testing.
Thermistor wiring or connectors require inspection.
The dryer is a heat-pump model.
Compressor discharge thermistor requires diagnosis.
The sensor tests correctly but the error remains.

The diagnostic procedure should always be matched to the exact LG dryer model.

Key Point

tE2 means Dryer Thermistor Out of Range Error, but its exact meaning depends on dryer type.

For a standard electric/gas LG dryer:

Temperature thermistor open/short → Check thermistor resistance

Very cold air entering through the exhaust duct can also make the sensor read abnormally cold and trigger tE2. In that situation, LG recommends warming the dryer before using Steam Fresh and checking the outdoor vent cap.

For an LG heat pump dryer:

tE2 → Compressor discharge (outlet) temperature thermistor open or short

The compressor thermistor should be tested using the appropriate model-specific values.

tE3 — Thermistor Out of Range or Too Hot Error

The tE3 error code on an LG dryer indicates a Dryer Thermistor Out of Range or Too Hot Error.

On the condensing dryer configuration covered by this diagnostic reference, tE3 indicates that the heater is not operating properly. The condition may result from abnormal supply voltage or from the heater thermostat being tripped because of overheating.

What Does the tE3 Error Code Mean?

The heating system depends on correct supply voltage, proper airflow, temperature sensing, and functioning heater components.

If the dryer detects an abnormal condition in this system, it may display:

tE3 — Thermistor Out of Range or Too Hot Error

The reference specifically describes tE3 as informing the user that the:

Heater is not working properly / dryer is not heating.

Therefore, troubleshooting should not focus on the thermistor alone.

Common Causes of tE3

The main areas to investigate include:

Low or incorrect supply voltage
Heater overheating
Restricted airflow
Dirty lint filter
Dirty condenser
Blocked rear air intake
Abnormal heater high thermistor (TH2)
Abnormal heater coil resistance

These conditions can either prevent the heater from operating or cause its protective system to interrupt heating.

Check the Power Supply First

The source places significant emphasis on checking the customer’s electrical supply.

The condensing dryer configuration described requires:

240 VAC

If the dryer is incorrectly connected to a:

120 VAC circuit

the source states that it will produce an immediate tE3 error.

This makes the incoming power supply one of the first things to verify before replacing heater components.

Check Voltage Between L1 and L2

The diagnostic reference specifies checking the customer’s wall outlet.

Measure voltage between:

L1 ↔ L2

If the measured voltage is:

Less than 200 VAC

the dryer can generate a tE3 error.

This check is particularly important after:

New dryer installation
Moving the appliance
Replacing the receptacle
Electrical work
Changing the power cord
Installing the dryer in a new location

Why Low Voltage Can Cause tE3

The heater requires the correct electrical supply to generate the expected heat.

If the dryer receives significantly less voltage than required, the heater cannot operate normally.

The control may then detect that the heating system is not behaving as expected and display tE3.

Therefore:

tE3 + no heat → Verify incoming voltage before replacing the heater

This can prevent unnecessary replacement of otherwise functional dryer components.

Check the Lint Filter

If the electrical supply is correct, airflow should be checked.

The source specifically instructs technicians to:

Clean the lint filter.

A heavily restricted lint filter reduces airflow through the dryer.

Reduced airflow can cause heat to accumulate around the heater assembly and lead to overheating.

Check the Condenser

The condenser should also be checked for accumulated lint and foreign material.

Restricted airflow through the condenser can cause the heater to operate at excessively high temperatures.

The source notes that some newer condensing dryer models do not have a removable condenser. Instead, they may include a Condenser Care function that automatically cleans the condenser when activated.

Follow the owner’s manual for the correct condenser-cleaning procedure for the specific dryer.

Check the Rear Air Intake

Do not focus only on the lint filter and condenser.

The source also instructs technicians to check the:

Air intake in the back of the dryer

for blockage.

Restricted intake airflow can contribute to heater overheating even if the lint filter itself appears clean.

A useful airflow inspection sequence is:

Lint filter → Condenser → Rear air intake

Why Restricted Airflow Matters

The heater generates a significant amount of heat during operation.

Normal airflow carries that heat through the dryer.

If lint or foreign objects restrict airflow, heat can accumulate around the heater assembly.

This can cause the heater’s protective thermostat to trip, resulting in a no-heat condition and potentially triggering tE3.

Check the Heater High Thermistor (TH2)

If the electrical supply and airflow are correct, the heater assembly thermistor should be tested.

The source identifies this sensor as:

Heater Assembly High Thermistor (TH2)

and provides the following resistance specification:

200 kΩ ±10% at 77°F (25°C).

This provides a specific reference for evaluating TH2 at approximately room temperature.

TH2 Resistance Specification

At approximately:

77°F / 25°C

the expected resistance is:

200 kΩ ±10%

That corresponds to an approximate acceptable range of:

180–220 kΩ

at the specified temperature.

Because thermistor resistance changes with temperature, the actual sensor temperature must be considered when evaluating the reading.

Check the Heater Coils

The direct diagnostic reference also provides resistance specifications for both heater coils.

Inner heater coil:
Yellow wire → White wire
28.96 Ω ±10%

Outer heater coil:
Blue wire → White wire
56.29 Ω ±10%.

These measurements help determine whether the heater coils are electrically within the expected range.

Heater Coil Reference Values

For the configuration covered by the source:

Inner Coil

Yellow → White
28.96 Ω ±10%

Outer Coil

Blue → White
56.29 Ω ±10%

These are model/configuration-specific diagnostic values and should not automatically be applied to every LG dryer.

Does tE3 Automatically Mean the Thermistor Is Bad?

No.

Despite tE3 being categorized as a thermistor/out-of-range error, the diagnostic reference identifies several other conditions that can produce it.

The correct troubleshooting sequence is closer to:

Power supply → Airflow → TH2 thermistor → Heater coils

rather than:

tE3 → Replace thermistor

This distinction is particularly important because incorrect supply voltage can cause the error immediately.

Does tE3 Automatically Mean the Heater Is Bad?

No.

The heater may stop operating because its protective thermostat has reacted to an overheating condition.

If the actual cause is:

Clogged lint filter
Restricted condenser
Blocked air intake

then replacing the heater without correcting the airflow restriction may fail to solve the underlying problem.

Likewise, a dryer connected to an incorrect 120 V supply cannot be repaired by replacing its heater.

tE3 vs. tE1

These codes point toward different diagnostic conditions.

tE1 — Thermistor Error
Associated with an open or short condition in the blower-housing thermistor circuit.

tE3 — Thermistor Out of Range or Too Hot Error
On the referenced condensing dryer configuration, associated with heater operation, abnormal voltage, overheating, TH2, and the heater assembly.

Therefore, the two codes should not use the same diagnostic procedure.

tE3 vs. tE2

tE2 can involve an out-of-range temperature sensor condition and, on standard dryers, can even be triggered by extremely cold air entering through the exhaust system.

tE3, by contrast, directs diagnosis toward:

Heater not working → Supply voltage → Overheating/airflow → TH2 → Heater coils

So even though both codes contain tE, their underlying diagnostic paths are significantly different.

Is tE3 an Airflow Error?

Not directly, but airflow restriction can be an important cause.

tE3 is not equivalent to:

d80 / d85 / d90 / d95 — Duct Restriction Errors

However, restricted airflow through the lint filter, condenser, or rear air intake can cause the heater to overheat and contribute to the tE3 condition.

What You Can Check First

Before internal electrical diagnosis:

Confirm that the dryer is connected to the correct electrical supply.
Check whether the dryer was recently installed or moved.
Clean the lint filter.
Clean or service the condenser according to the model instructions.
Make sure the rear air intake is not blocked.
Check whether tE3 returns.

If the code remains, electrical diagnosis of the power supply, TH2, and heater assembly may be required.

When to Call an Electrician

An electrician may be needed if:

The dryer is connected to an incorrect circuit.
L1-to-L2 voltage is below the required level.
A 240 V dryer is receiving only 120 V.
The receptacle or household electrical supply is incorrect.

Correcting the appliance itself will not solve an inadequate household power supply.

When to Call an Appliance Technician

Professional appliance diagnosis is appropriate when:

Supply voltage is correct but tE3 remains.
Heater continues to overheat.
Airflow restrictions have been corrected.
TH2 resistance requires testing.
Heater coil resistance requires testing.
Heater assembly requires inspection.

Key Point

tE3 means Dryer Thermistor Out of Range or Too Hot Error.

For the condensing dryer configuration covered by the source, the error indicates that the heater is not operating properly because of overheating or abnormal supply voltage.

The main diagnostic path is:

Check power supply → Check airflow → Check TH2 → Check heater coils

Important reference values are:

L1–L2 below 200 VAC can cause tE3
TH2: 200 kΩ ±10% at 77°F
Inner heater coil: 28.96 Ω ±10%
Outer heater coil: 56.29 Ω ±10%

Also, a 240 V condensing dryer connected to a 120 V circuit can produce an immediate tE3 error.

tE4 — Steam Generator Error

The tE4 error code on an LG dryer indicates a Steam Generator Error.

This code is associated with the steam generator thermistor. According to the diagnostic reference, tE4 occurs when the steam generator thermistor reading is outside the expected range.

Because this error relates specifically to the steam system, it should not be diagnosed in the same way as the main dryer temperature thermistor errors.

What Does the tE4 Error Code Mean?

On applicable LG dryers, the steam generator uses a thermistor to monitor temperature.

The thermistor changes resistance as its temperature changes, allowing the Main PCB to monitor steam generator temperature.

If the thermistor signal falls outside the expected range, the dryer may display:

tE4 — Steam Generator Error

The primary diagnostic area is therefore:

Steam generator thermistor → Wiring/connectors → Main PCB

Common Causes of the tE4 Error

The main possibilities include:

Steam generator thermistor out of range
Defective steam generator thermistor
Open or shorted thermistor circuit
Loose connector
Damaged wiring between the thermistor and Main PCB
Main PCB problem

The thermistor circuit should be tested before replacing components.

Check the Steam Generator Thermistor

The source instructs technicians to check the steam generator thermistor resistance.

There are several possible measurement locations.

The circuit can be checked from the Main Board at the:

Blue 6-pin connector

using:

Pin 3 — Gray wire
to
Pin 6 — Black wire

This allows the thermistor circuit to be evaluated from the control-board side.

Check at the Steam Generator Connector

The thermistor circuit can also be checked at the steam generator connection.

The reference identifies a:

10-pin connector

with the measurement taken between:

Pin 1 — Gray wire
and
Pin 6 — Black wire.

This provides another point for determining whether the abnormal reading originates in the sensor or elsewhere in the circuit.

Check Directly at the Thermistor

The thermistor can also be tested directly between its:

Gray wire → Black wire

Testing at multiple points can help isolate a wiring or connector problem.

For example:

Incorrect reading at Main PCB but correct reading directly at thermistor
→ Wiring or connector problem becomes more likely.

Incorrect reading directly at thermistor
→ Thermistor itself becomes a stronger suspect.

Thermistor Resistance Specification

The source provides a specific reference value for the steam generator thermistor:

At 212°F (100°C): 3.33 kΩ

This value can be used when evaluating the thermistor at the specified temperature.

Because thermistor resistance changes with temperature, a resistance measurement should always be interpreted in relation to the actual sensor temperature.

Thermistor Voltage Specification

The reference also provides a voltage value:

At 212°F (100°C): approximately 0.9 VDC.

This gives technicians another way to evaluate whether the steam generator temperature signal is within the expected range.

5 VDC vs. 0 VDC Diagnostic Check

The source provides an especially useful diagnostic distinction.

If the circuit measurement shows:

5 VDC → Thermistor is defective and should be replaced

If the measurement shows:

0 VDC → Main Board is defective and should be replaced.

This can help distinguish a sensor problem from a control-board problem.

Why Wiring Should Be Checked

A tE4 code does not necessarily prove that the thermistor itself has failed.

The Main PCB relies on the electrical signal traveling through the complete circuit:

Steam generator thermistor → Connector → Wiring harness → Main PCB

A loose terminal, damaged wire, or poor connection can alter or interrupt the thermistor signal.

Inspect for:

Loose connectors
Broken wires
Damaged terminals
Pinched wiring
Heat-damaged insulation
Corrosion
Poor electrical contact

Does tE4 Automatically Mean the Thermistor Is Bad?

No.

The code indicates that the steam generator thermistor signal is out of range.

The fault may be caused by:

Thermistor → Wiring/connector → Main PCB

This is why resistance and voltage testing are useful before replacing parts.

Does tE4 Mean the Steam Generator Must Be Replaced?

Not automatically.

The direct diagnostic page specifically identifies the steam generator thermistor as the component that should be checked.

Diagnosis should begin with the thermistor circuit rather than assuming that the complete steam generator assembly has failed.

tE4 vs. E1

Both codes can involve the steam system, but they describe different conditions.

E1 — Steam Module Overheating
Associated with excessive steam-module temperature.

tE4 — Steam Generator Error
Associated with the steam generator thermistor being out of range.

Therefore, an E1 diagnosis should not automatically be applied to tE4.

tE4 vs. E3

E3 also relates to the steam system, but it represents a different problem.

E3 — No Water Supply (for Steam)

This directs troubleshooting toward the steam water supply and related components.

By contrast:

tE4 → Steam generator temperature sensing

tE4 vs. E4

The codes look similar but should not be confused.

E4 — Steam Heating Error
The steam system fails to reach the expected heating condition.

tE4 — Steam Generator Error
The steam generator thermistor reading is out of range.

This distinction is particularly useful because both codes can appear on dryers equipped with steam functions.

Is tE4 a Main Dryer Temperature Error?

No.

Unlike some other tE codes, tE4 is specifically associated with the:

Steam Generator Thermistor

It should not automatically be diagnosed using the blower-housing thermistor or other dryer temperature sensors.

Can You Reset the tE4 Error?

Power-cycling the dryer may clear the displayed code temporarily, but it will not repair an abnormal thermistor circuit.

If tE4 returns, the steam generator thermistor circuit should be diagnosed.

Repeated resets should not be used as a substitute for testing the underlying problem.

What You Can Check First

If tE4 appears:

Record the complete dryer model number.
Confirm that the dryer is equipped with the applicable steam system.
Disconnect the dryer from power before inspecting wiring.
Inspect accessible steam-generator connectors and wiring.
Check for loose or damaged connections.
If qualified, test the steam generator thermistor resistance.
Compare the measurement with the appropriate temperature specification.

Internal voltage testing should be performed only by someone qualified to work on appliance electrical systems.

When to Call a Professional Technician

Professional diagnosis is recommended when:

tE4 repeatedly returns.
Steam generator thermistor resistance requires testing.
Thermistor voltage requires measurement.
Wiring between the steam generator and Main PCB requires diagnosis.
Thermistor tests normally but tE4 remains.
Main PCB operation needs to be evaluated.

Model-specific wiring information should be used during diagnosis.

Key Point

tE4 means Steam Generator Error.

More specifically, the dryer detects that the steam generator thermistor is out of range.

The direct diagnostic reference provides these important values:

Steam generator thermistor at 212°F (100°C):

Resistance: 3.33 kΩ
Voltage: 0.9 VDC

It also provides this diagnostic distinction:

5 VDC → Defective thermistor
0 VDC → Defective Main Board

The main diagnostic path is:

Steam generator thermistor → Wiring/connectors → Main PCB

tE5 — Compressor Inlet Thermistor Error

The tE5 error code on an LG dryer indicates a Compressor Inlet Thermistor Error.

This code is associated with the temperature sensor that monitors conditions at the compressor inlet. The error occurs when the dryer detects that the compressor inlet thermistor circuit is open or shorted.

Because this sensor is associated with the compressor system, tE5 should not be diagnosed using the same procedure as the blower-housing thermistor or steam generator thermistor.

What Does the tE5 Error Code Mean?

The compressor inlet thermistor is a temperature-sensitive sensor.

Its resistance changes with temperature, allowing the Main Board to monitor the temperature at the compressor inlet.

If the thermistor circuit becomes electrically open or shorted, the control can no longer receive a valid temperature signal and may display:

tE5 — Compressor Inlet Thermistor Error

The primary diagnostic path is:

Compressor inlet thermistor → Wiring/connectors → Main Board

Common Causes of the tE5 Error

Possible causes include:

Open compressor inlet thermistor
Shorted compressor inlet thermistor
Thermistor resistance outside the expected range
Damaged wiring
Loose or damaged connector
Open circuit between the thermistor and Main Board
Short circuit in the thermistor wiring
Main Board problem

The thermistor circuit should be tested before components are replaced.

Check the Compressor Inlet Thermistor Resistance

The diagnostic reference instructs technicians to measure the resistance of the compressor inlet thermistor and compare the reading with the appropriate temperature/resistance chart.

Because thermistor resistance changes with temperature, the resistance reading must be evaluated in relation to the actual temperature of the sensor.

The basic diagnostic principle is:

Measure resistance → Determine sensor temperature → Compare with the thermistor temperature chart

An abnormal reading may indicate a defective thermistor or a problem in its electrical circuit.

Test the Thermistor From the Main Board

The source provides a specific location for checking the compressor inlet thermistor from the Main Board.

Use the:

White 8-pin connector

and measure between:

Pin 2 — Black wire
and
Pin 5 — Blue wire

This measurement reads the resistance of the compressor inlet thermistor through the circuit connected to the Main Board.

Testing from this location can help evaluate both the sensor and the wiring path leading to it.

Why Testing From the Main Board Is Useful

Testing the thermistor directly can confirm whether the sensor itself has the expected resistance.

However, the Main Board does not see the sensor directly—it receives the signal through the wiring harness and connectors.

Therefore, a sensor may test correctly at the thermistor while the Main Board receives an incorrect signal because of:

Broken wiring
Loose terminal
Damaged connector
Poor electrical contact
Open circuit
Shorted wiring

Measuring from the Main Board helps determine what the control is actually seeing.

Test Directly at the Thermistor

The source also states that resistance can be measured directly at the:

Thermistor harness connection

This creates a useful comparison.

For example:

Incorrect reading at Main Board + correct reading at thermistor
→ Inspect wiring and connectors between the two.

Incorrect reading directly at thermistor
→ Thermistor becomes the primary suspect.

Correct readings throughout circuit + recurring tE5
→ Main Board may require further diagnosis.

5 VDC Indicates an Open Thermistor

The diagnostic reference provides an important voltage test.

If the circuit reads:

5 VDC

the source identifies the thermistor as open and states that it should be replaced.

An open thermistor means the electrical path through the sensor has been interrupted and the Main Board cannot receive the expected temperature signal.

0 VDC Indicates a Main Board Problem

The source provides a second diagnostic condition.

If the measurement is:

0 VDC

the diagnostic reference identifies the Main Board as defective and recommends replacement.

Therefore, the source’s diagnostic distinction is:

5 VDC → Open thermistor → Replace thermistor

0 VDC → Main Board defective → Replace Main Board

These tests should be performed only by someone qualified to diagnose appliance electronic circuits.

Check the Wiring and Connectors

Before replacing either component, inspect the thermistor circuit carefully.

Look for:

Loose connectors
Backed-out terminals
Broken wires
Pinched wiring
Damaged insulation
Corrosion
Heat damage
Poor electrical contact

An open or shorted wiring harness can interfere with the temperature signal and should be ruled out during diagnosis.

Does tE5 Automatically Mean the Thermistor Is Bad?

No.

The direct diagnostic reference defines tE5 as an open or short condition involving the compressor inlet thermistor, but the complete electrical path should still be considered.

The problem may involve:

Thermistor → Harness/connectors → Main Board

This is why testing at both the Main Board and thermistor harness is useful.

Does tE5 Mean the Compressor Has Failed?

No.

This distinction is important.

tE5 is associated with the compressor inlet temperature sensor, not necessarily the compressor itself.

The code does not by itself confirm a mechanical or electrical compressor failure.

The primary problem indicated by tE5 is:

Compressor inlet temperature sensing

rather than:

Compressor failure

tE5 vs. tE4

Both codes involve temperature sensors, but they monitor different systems.

tE4 — Steam Generator Error
Associated with the steam generator thermistor being out of range.

tE5 — Compressor Inlet Thermistor Error
Associated with an open or shorted compressor inlet thermistor.

The two codes therefore require different sensor locations and diagnostic procedures.

tE5 vs. tE2 on Heat Pump Models

This is another important distinction.

For the heat-pump configuration we verified under tE2:

tE2 → Compressor discharge/outlet temperature thermistor

For tE5:

tE5 → Compressor inlet temperature thermistor

In simplified terms:

tE2 → Compressor outlet/discharge temperature

tE5 → Compressor inlet temperature

This distinction can help technicians identify which temperature sensor circuit requires testing.

Is tE5 a Heating Element Error?

No.

tE5 does not directly indicate a conventional electric heating-element failure.

It points to the compressor inlet thermistor circuit.

Replacing a heating element would not address an open or shorted compressor inlet temperature sensor.

Can You Reset the tE5 Error?

Power-cycling the dryer may temporarily clear the displayed code, but it cannot repair an open or shorted thermistor circuit.

If tE5 returns, the sensor circuit should be diagnosed.

Repeatedly resetting the appliance should not be used as a substitute for identifying the electrical problem.

What You Can Check First

If tE5 appears:

Record the complete dryer model number.
Disconnect the dryer from power before inspecting wiring.
Inspect accessible thermistor wiring and connectors.
Look for loose, damaged, or disconnected terminals.
If qualified, measure compressor inlet thermistor resistance.
Compare the resistance with the appropriate temperature chart.
Compare readings at the thermistor harness and Main Board if necessary.

Live voltage diagnosis should be performed only by someone qualified to work on appliance electronics.

When to Call a Professional Technician

Professional diagnosis is recommended when:

tE5 repeatedly returns.
Compressor inlet thermistor resistance requires measurement.
Thermistor wiring requires continuity testing.
Main Board connector measurements are required.
5 VDC or 0 VDC diagnostic testing is needed.
The thermistor tests normally but the error continues.

The exact dryer model and wiring configuration should always be confirmed before performing electrical tests.

Key Point

tE5 means Compressor Inlet Thermistor Error.

The direct diagnostic reference identifies the cause as an open or shorted compressor inlet thermistor and recommends checking its resistance against the appropriate temperature chart.

The thermistor can be checked from the Main Board at the:

White 8-pin connector → Pin 2 Black wire to Pin 5 Blue wire

or directly at the thermistor harness connection.

The source also provides this diagnostic distinction:

5 VDC → Thermistor open → Replace thermistor
0 VDC → Main Board defective → Replace Main Board

The main diagnostic path is:

Compressor inlet thermistor → Wiring/connectors → Main Board

tE6 — Compressor Outlet Thermistor Error

The tE6 error code on an LG dryer indicates a Compressor Outlet Thermistor Error.

This code appears when the dryer detects an open or short circuit in the compressor outlet thermistor.

The compressor outlet thermistor monitors temperature on the outlet side of the compressor system. If the Main Board cannot receive a valid temperature signal from this sensor, the dryer may display the tE6 error.

What Does the tE6 Error Code Mean?

The compressor outlet thermistor is a temperature-sensitive sensor whose resistance changes with temperature.

The Main Board uses this signal to monitor compressor outlet temperature during dryer operation.

If the thermistor circuit becomes:

Open
Shorted
Electrically disconnected

the control may no longer receive a valid temperature reading and can display:

tE6 — Compressor Outlet Thermistor Error

The direct diagnostic reference identifies an open or shorted compressor outlet thermistor as the cause of tE6.

Check the Compressor Outlet Thermistor Resistance

The primary diagnostic step is to measure the resistance of the compressor outlet thermistor.

The measured resistance should be compared with the appropriate temperature/resistance chart for the sensor.

Because thermistor resistance changes with temperature, a resistance reading should always be evaluated relative to the actual temperature.

The basic diagnostic process is:

Measure resistance → Determine sensor temperature → Compare with the thermistor temperature chart

If the resistance does not correspond to the expected value, the thermistor may be defective.

Test the Thermistor From the Main Board

The diagnostic reference provides a specific measurement point at the Main Board.

Use the:

White 8-pin connector

and measure between:

Pin 2 — Black wire
and
Pin 4 — Red wire

This reads the resistance of the compressor outlet thermistor through the circuit connected to the Main Board.

Why Test From the Main Board?

Testing from the Main Board can help evaluate more than just the thermistor.

The complete signal path is:

Compressor outlet thermistor → Harness/connectors → Main Board

A thermistor may test correctly when measured directly at the sensor but still provide an incorrect signal to the Main Board because of:

Broken wiring
Loose connector
Damaged terminal
Poor electrical contact
Open harness circuit
Shorted wiring

Testing from the Main Board helps determine what the control is actually seeing.

Test Directly at the Thermistor

The source also allows the thermistor to be measured directly at its harness connection.

Comparing the two measurements can help isolate the problem.

Incorrect at Main Board + correct at thermistor
→ Inspect wiring and connectors.

Incorrect directly at thermistor
→ Thermistor becomes the primary suspect.

Correct at both locations + recurring tE6
→ Main Board may require further diagnosis.

5 VDC Indicates an Open Thermistor

The diagnostic reference provides a useful voltage test.

If the circuit reads:

5 VDC

the source identifies the thermistor as open and states that the thermistor needs to be replaced.

An open circuit prevents the Main Board from receiving the expected temperature-sensor signal.

0 VDC Indicates a Main Board Problem

If the circuit reads:

0 VDC

the source identifies the Main Board as defective and recommends replacement.

Therefore, the diagnostic distinction provided by the reference is:

5 VDC → Thermistor open → Replace thermistor

0 VDC → Main Board defective → Replace Main Board

Electrical measurements should only be performed by someone qualified to diagnose appliance electronic circuits.

Check the Wiring and Connectors

Before replacing components, inspect the circuit between the compressor outlet thermistor and Main Board.

Look for:

Loose connectors
Broken wires
Backed-out terminals
Pinched wiring
Damaged insulation
Corrosion
Heat damage
Poor terminal contact

A wiring problem can interrupt or distort the thermistor signal and produce the same symptoms as a defective sensor.

Does tE6 Automatically Mean the Thermistor Is Bad?

No.

The error indicates an abnormal condition involving the compressor outlet thermistor circuit.

The complete diagnostic path should include:

Thermistor → Wiring/connectors → Main Board

Testing both at the thermistor harness and from the Main Board can help determine where the fault is located.

Does tE6 Mean the Compressor Has Failed?

No.

Although the sensor monitors compressor outlet temperature, tE6 does not by itself indicate a failed compressor.

The code specifically identifies a problem with the:

Compressor Outlet Thermistor

rather than the compressor itself.

A compressor should not be replaced solely because tE6 is displayed.

tE6 vs. tE5

This is the most important distinction between these two codes.

tE5 — Compressor Inlet Thermistor Error
Monitors temperature at the compressor inlet.

tE6 — Compressor Outlet Thermistor Error
Monitors temperature at the compressor outlet.

The Main Board connector measurements are also different:

tE5:
White 8-pin connector
Pin 2 Black → Pin 5 Blue

tE6:
White 8-pin connector
Pin 2 Black → Pin 4 Red

The correct sensor circuit must therefore be identified before testing.

tE6 vs. tE2

On the heat-pump configuration covered under tE2, the code can also involve a compressor discharge/outlet temperature thermistor.

However, tE6 has its own direct diagnostic definition and testing procedure.

For tE6, the source specifically identifies:

Compressor Outlet Thermistor Open or Short

and provides the White 8-pin Main Board connector test between Pin 2 Black and Pin 4 Red.

For this reason, always use the exact dryer model and its model-specific diagnostic information rather than assuming that similar thermistor codes are interchangeable.

Is tE6 a Heating Element Error?

No.

tE6 does not directly indicate failure of a conventional heating element.

It points to a temperature-sensing circuit associated with the compressor outlet.

Replacing a heating element would not correct an open or shorted compressor outlet thermistor circuit.

Can You Reset the tE6 Error?

Power-cycling the dryer may temporarily clear the displayed code, but it will not repair an open or shorted thermistor circuit.

If tE6 returns, the compressor outlet thermistor circuit should be diagnosed.

What You Can Check First

If tE6 appears:

Record the complete LG dryer model number.
Disconnect power before inspecting internal wiring.
Inspect accessible thermistor wiring and connectors.
Look for loose or damaged connections.
If qualified, measure compressor outlet thermistor resistance.
Compare the resistance with the appropriate temperature chart.
Compare measurements at the thermistor harness and Main Board if necessary.

Internal electrical testing should be performed by a qualified technician.

When to Call a Professional Technician

Professional diagnosis is recommended when:

tE6 repeatedly returns.
Compressor outlet thermistor resistance requires testing.
Wiring continuity needs to be checked.
Main Board connector measurements are required.
The thermistor tests normally but tE6 remains.
Main Board operation requires diagnosis.

The exact wiring configuration should always be confirmed for the specific dryer model.

Key Point

tE6 means Compressor Outlet Thermistor Error.

The direct diagnostic reference identifies the cause as an open or shorted compressor outlet thermistor. The thermistor resistance should be compared with the appropriate temperature chart.

The source specifies this Main Board measurement:

White 8-pin connector → Pin 2 Black wire to Pin 4 Red wire

It also provides the following diagnostic distinction:

5 VDC → Thermistor open → Replace thermistor
0 VDC → Main Board defective → Replace Main Board

The main diagnostic path is:

Compressor outlet thermistor → Wiring/connectors → Main Board

tE7 — Evaporator Inlet Thermistor Error

The tE7 error code on an LG dryer indicates an Evaporator Inlet Thermistor Error.

This code appears when the dryer detects an open or short circuit in the evaporator inlet thermistor. The thermistor monitors temperature at the inlet side of the evaporator and provides temperature information to the dryer’s electronic control system.

If the Main Board cannot receive a valid signal from this sensor, the dryer may display the tE7 error.

What Does the tE7 Error Code Mean?

The evaporator inlet thermistor is a temperature-sensitive sensor.

Its electrical resistance changes as temperature changes, allowing the dryer control system to monitor conditions around the evaporator.

According to the diagnostic reference, the direct cause of tE7 is:

Evaporator Inlet Thermistor Open or Short.

This means diagnosis should focus primarily on the thermistor circuit rather than assuming that the evaporator or compressor itself has failed.

Common Causes of the tE7 Error

Possible causes include:

Open evaporator inlet thermistor
Shorted evaporator inlet thermistor
Thermistor resistance outside the expected range
Loose thermistor connection
Damaged wiring
Open or short in the sensor circuit
Poor connector contact
Main Board problem

The thermistor and its electrical circuit should be tested before replacing major components.

Check the Evaporator Inlet Thermistor Resistance

The source instructs technicians to measure the resistance of the:

Evaporator Inlet Thermistor

and compare the measurement with the appropriate temperature/resistance chart.

Because a thermistor changes resistance with temperature, a resistance measurement by itself is not enough.

The correct diagnostic approach is:

Measure resistance → Determine actual sensor temperature → Compare with the temperature chart

If the resistance does not correspond to the expected value at that temperature, the thermistor may be defective.

Test the Thermistor From the Main Board

The diagnostic reference provides a specific test location at the Main Board.

Use the:

White 8-pin connector

and measure between:

Pin 2 — Black wire
and
Pin 3 — Brown wire

This measurement reads the resistance of the evaporator inlet thermistor through the circuit connected to the Main Board.

Why Test From the Main Board?

Testing from the Main Board evaluates more than the sensor alone.

The signal must travel through the complete circuit:

Evaporator inlet thermistor → Wiring harness → Connectors → Main Board

A thermistor could test correctly when measured directly at the sensor but still produce an error because of:

Broken wiring
Loose terminal
Poor connector contact
Damaged harness
Open circuit
Shorted wiring

Measuring from the Main Board helps determine what resistance the control system is actually seeing.

Test Directly at the Thermistor

The diagnostic reference also states that the thermistor can be measured directly at its:

Thermistor harness connection.

Comparing the two measurements can help isolate the problem.

Incorrect reading at Main Board + correct reading at thermistor
→ Inspect wiring and connectors.

Incorrect reading directly at thermistor
→ Thermistor becomes the primary suspect.

Correct reading at both locations + recurring tE7
→ Main Board may require further diagnosis.

5 VDC Indicates an Open Thermistor

The source provides an additional voltage-based diagnostic test.

If the circuit reads:

5 VDC

the thermistor is open and needs to be replaced.

An electrically open sensor prevents the Main Board from receiving the expected temperature signal.

0 VDC Indicates a Main Board Problem

If the measurement is:

0 VDC

the diagnostic reference identifies the Main Board as defective and recommends replacement.

Therefore, the source provides this diagnostic distinction:

5 VDC → Thermistor open → Replace thermistor

0 VDC → Main Board defective → Replace Main Board

These electrical tests should be performed only by someone qualified to diagnose appliance electronic circuits.

Check the Wiring and Connectors

Before replacing the thermistor or Main Board, inspect the electrical path between them.

Look for:

Loose connectors
Broken wires
Backed-out terminals
Pinched wiring
Damaged insulation
Corrosion
Heat damage
Poor terminal contact

A wiring problem can interrupt the thermistor signal and produce the same error condition as a failed sensor.

Does tE7 Automatically Mean the Thermistor Is Bad?

No.

tE7 indicates an open or short condition involving the evaporator inlet thermistor circuit.

The complete diagnostic path should include:

Thermistor → Wiring/connectors → Main Board

Testing from both the thermistor harness and Main Board can help determine where the abnormal signal originates.

Does tE7 Mean the Evaporator Has Failed?

No.

The word “evaporator” in the error description identifies the location monitored by the temperature sensor.

It does not mean the evaporator itself has failed.

The code specifically identifies:

Evaporator Inlet Thermistor Error

rather than an evaporator mechanical failure.

Does tE7 Mean the Compressor Has Failed?

No.

The error does not directly diagnose the compressor.

Although the thermistor is part of the temperature-monitoring system used around the heat-pump refrigeration circuit, tE7 specifically identifies an abnormal evaporator inlet thermistor circuit.

Compressor replacement should not be based on tE7 alone.

tE7 vs. tE5

These codes identify different temperature sensors:

tE5 — Compressor Inlet Thermistor Error

tE7 — Evaporator Inlet Thermistor Error

They therefore refer to different sensor locations and should not be treated as interchangeable.

tE7 vs. tE6

tE6 and tE7 also monitor different locations:

tE6 — Compressor Outlet Thermistor Error

tE7 — Evaporator Inlet Thermistor Error

For the diagnostic references we have verified, the Main Board test points are:

tE6:
White 8-pin connector
Pin 2 Black → Pin 4 Red

tE7:
White 8-pin connector
Pin 2 Black → Pin 3 Brown

Using the correct sensor circuit is essential when diagnosing these codes.

tE5, tE6, and tE7 at a Glance

These three codes now form a useful group:

tE5 → Compressor Inlet Thermistor

tE6 → Compressor Outlet Thermistor

tE7 → Evaporator Inlet Thermistor

Although all three are thermistor-related, each identifies a different temperature-monitoring point in the dryer system.

Is tE7 a Conventional Heater Error?

No.

tE7 does not directly indicate a conventional electric heating-element problem.

The code points specifically toward the:

Evaporator Inlet Thermistor Circuit

Diagnosis should begin with the sensor, wiring, connectors, and signal reaching the Main Board.

Can You Reset the tE7 Error?

Power-cycling the dryer may temporarily remove the displayed code, but it will not repair an electrically open or shorted thermistor circuit.

If tE7 returns, the sensor circuit should be diagnosed.

Repeatedly resetting the dryer should not replace proper troubleshooting.

What You Can Check First

If tE7 appears:

Record the complete LG dryer model number.
Disconnect power before inspecting internal wiring.
Inspect accessible thermistor wiring and connectors.
Look for loose, damaged, or disconnected terminals.
If qualified, measure evaporator inlet thermistor resistance.
Compare the measurement with the appropriate temperature chart.
Compare readings at the thermistor harness and Main Board if necessary.

Internal electrical testing should be performed by a qualified technician.

When to Call a Professional Technician

Professional diagnosis is recommended when:

tE7 repeatedly returns.
Evaporator inlet thermistor resistance requires testing.
Wiring continuity requires diagnosis.
Main Board connector measurements are necessary.
5 VDC or 0 VDC diagnostic testing is required.
The thermistor tests correctly but tE7 remains.

The exact dryer model and its wiring information should always be confirmed before performing internal electrical tests.

Key Point

tE7 means Evaporator Inlet Thermistor Error.

The direct diagnostic reference identifies the cause as an open or shorted evaporator inlet thermistor. Resistance should be checked and compared with the appropriate temperature chart.

The source specifies this Main Board measurement:

White 8-pin connector → Pin 2 Black wire to Pin 3 Brown wire

It also provides the following diagnostic distinction:

5 VDC → Thermistor open → Replace thermistor
0 VDC → Main Board defective → Replace Main Board

The main diagnostic path is:

Evaporator inlet thermistor → Wiring/connectors → Main Board

UP — ThinQ UP Feature Update (Not an Error)

The UP message on an LG dryer is not an error code.

It is a notification from the LG ThinQ UP feature indicating that a compatible appliance has a new feature update available.

If UP appears on the dryer display, it does not normally indicate a failed component or a problem that requires appliance repair. Instead, the dryer is notifying you that new or updated functionality may be available through the LG ThinQ system.

What Does UP Mean on an LG Dryer?

UP stands for a ThinQ UP feature notification.

When compatible upgradeable content becomes available, the dryer may display an update notification when the appliance is turned on.

The available update can then be reviewed through the LG ThinQ app.

In simple terms:

UP → Feature update available → Check LG ThinQ

It is a software or feature notification rather than a diagnostic fault.

Is UP an LG Dryer Error Code?

No.

The diagnostic reference specifically identifies UP as:

Not an error code.

It does not by itself indicate a problem with the:

Heating system
Motor
Thermistors
Airflow system
Main control board
Power supply
Compressor

If the dryer is otherwise operating normally, seeing UP is not a reason to replace parts or schedule a repair.

Why Does the Dryer Display UP?

LG ThinQ UP allows supported appliances to receive certain new or modified features after the appliance has been manufactured.

When new upgradeable content is available, the appliance can notify the user through its control panel.

The LG ThinQ app can then be used to review the available update.

What Features Can Be Updated?

Available features depend on the appliance and model.

For laundry appliances, the diagnostic reference gives examples such as:

Pet care cycle
Display wallpaper
Dispenser amount settings
Dry-level adjustments

Not every dryer supports every feature, and available updates can vary by model. Some UP features may also require additional hardware before they can be used.

How to Update an LG Dryer After the UP Notification

When UP appears:

Open the LG ThinQ app.
Check the appliance’s update notification.
Review the new features available for the dryer.
Open the Upgrade Center.
Select the available update.
Allow the update process to complete.

After installation, supported functions can be configured through the settings in the Upgrade Center.

Do Not Turn Off the Dryer During the Update

Once an update has started, do not unplug or turn off the appliance during the update process.

Allow the software update to finish before disconnecting power or attempting to use the updated functions.

What Happens on the Dryer Display?

According to the diagnostic reference, when the UP notification appears, the display segments may rotate through a sequence before returning to the normal status display.

This behavior is part of the update notification and should not automatically be interpreted as a control-panel malfunction.

Why Doesn’t Every LG Dryer Have the UP Feature?

ThinQ UP is only available on compatible appliances.

The reference notes that some units manufactured in 2022 already contained the necessary capability, while the feature was activated beginning in April 2023 for applicable products.

Older dryers or models without ThinQ UP support may not display this notification.

Does UP Mean the Dryer Needs Repair?

No.

If UP is displayed and the dryer otherwise operates normally, no repair is normally required.

The message indicates:

New ThinQ feature available

rather than:

Appliance malfunction detected

This is an important distinction because not every code or message shown on an LG dryer display represents a fault.

What If You Don’t Want to Install the Update?

The UP notification itself does not mean that the dryer has developed a mechanical or electrical problem.

If you do not immediately install the available feature update, that should not be confused with an unresolved dryer error.

If you choose to perform the update, follow the instructions provided through LG ThinQ and the Upgrade Center.

UP vs. Actual LG Dryer Error Codes

Actual diagnostic codes usually indicate that the control system has detected an abnormal operating condition involving systems such as:

Temperature sensing
Heating
Airflow
Motor operation
Drainage
Power supply
Electronic communication

UP is different.

It is an information/update notification, not a diagnostic fault.

Key Point

UP is not an LG dryer error code.

It is a ThinQ UP Feature notification indicating that compatible upgradeable content is available for the appliance.

The basic process is:

UP appears → Open LG ThinQ → Check available Feature Update → Use Upgrade Center → Complete update

If the dryer is otherwise working normally, the UP message does not indicate that a component has failed or that the dryer requires repair.

How LG Dryer Error Codes Work
What an LG Dryer Error Code Can Tell You
An Error Code Does Not Always Mean a Part Has Failed
Why LG Dryer Error Codes Can Vary by Model
What to Do When an Error Code Appears
Can You Clear an LG Dryer Error Code?
When an Error Code Requires Professional Diagnosis
Find Your LG Dryer Error Code
Add — Add Water Information Code
AE — Compressor Error
big / bi9 — Steam Fresh Large Load Indicator
d80 — Duct Restriction Error
d85 — Duct Restriction Error
d90 — Duct Restriction Error
d95 — Duct Restriction Error
dE — Door Not Closed Error
dE2 — Door Not Locked Error
drn — Drain Pump Error
E1 — Steam Module Overheating
E13 — Drain Pump Error
E3 — No Water Supply (for Steam)
E4 — Steam Heating Error
E5 — Steam Pump Error
EE — EEPROM Error
F0 / FO — Filter Not Inserted Error
F1 — Thermistor Error
9A5 — Gas Dryer Not Heating Error
HS — Humidity Sensor Error
IF / 1F — Filter Missing Error
LE1 — Motor Error
LE2 — Drum Motor Low Amperage / Compressor Error
LE3 — Heat Pump Restricted Fan Error
nC — NFC Module Error
nE — Modem Is Abnormal Error
nF — Wi-Fi Is Not Connected to Router (Not an Error)
nP — Power Supply Voltage Error
nU — NFC Module Error
OE — Drain Pump Error
PF — Power Supply Voltage Error
PS — Power Supply Voltage Error
tE1 — Thermistor Error
tE2 — Thermistor Out of Range Error
tE3 — Thermistor Out of Range or Too Hot Error
tE4 — Steam Generator Error
tE5 — Compressor Inlet Thermistor Error
tE6 — Compressor Outlet Thermistor Error
tE7 — Evaporator Inlet Thermistor Error
UP — ThinQ UP Feature Update (Not an Error)

Dryer Repair Throughout the Denver Metro Area

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TROUBLESHOOTING BY PROBLEM

Refrigerator Not Cooling
Dishwasher Not Draining
Washer Won’t Drain
Appliance Making Noise

Dryer Not Heating
Appliance Leaking Water
Oven Not Heating
Appliance Won’t Turn On

FEATURED REPAIR GUIDES

Why Is My Refrigerator Not Cooling?

Common causes include dirty condenser coils, failed fans, defrost problems, sensors, and sealed-system failures.

Why Won’t My Washer Drain?

Learn what causes drainage issues and how to diagnose pumps, hoses, and filters.

Why Is My Dryer Not Heating?

Find out the most common reasons why your dryer doesn’t heat and how to fix them.

Oven Not Heating? Top 6 Causes

From bad igniters to control boards—here’s how to identify the problem.

LG Dryer Error Codes & Troubleshooting Guide

BROWSE LG ERROR CODES BY APPLIANCE

LG REFRIGERATOR ERROR CODES

LG WASHER ERROR CODES

LG DRYER ERROR CODES

LG OVEN & RANGE ERROR CODES

LG DISHWASHER ERROR CODES

On This Page

Understanding LG Dryer Error Codes

How LG Dryer Error Codes Work

What an LG Dryer Error Code Can Tell You

What the Code Actually Identifies

Symptoms Still Matter

Key Point

An Error Code Does Not Always Mean a Part Has Failed

Example: Temperature Sensor Error

Example: Heating Problem

Check Simple Conditions First

Key Point

Why LG Dryer Error Codes Can Vary by Model

Electric and Gas Dryers Can Differ

Standard and Smart Models May Differ

Model-Specific Specifications Matter

Find the Model Number

Key Point

What to Do When an Error Code Appears

Step 1: Record the Exact Code

Step 2: Note When the Code Appeared

Step 3: Check Basic Conditions

Step 4: Restart the Dryer

Step 5: Look Up the Exact Code

Step 6: Avoid Unsafe Disassembly

Key Point

Can You Clear an LG Dryer Error Code?

Basic Reset

When a Reset Can Help

When a Reset Will Not Fix the Problem

Do Not Repeatedly Reset an Active Fault

Some Messages Are Not Errors

Key Point

When an Error Code Requires Professional Diagnosis

Electrical Testing May Be Required

Gas Dryers Require Additional Caution

High-Voltage Circuits

When to Stop DIY Troubleshooting

Key Point

Find Your LG Dryer Error Code

Match the Code Exactly

Use the Exact Model When Possible

Start With the Simplest Checks

Do Not Replace Parts Based on the Code Alone

Need Professional LG Dryer Repair?

Add — Add Water Information Code

What Does the Add Code Mean?

Is Add an Error Code?

Common Causes

What You Can Check

What to Do If Add Appears After the Cycle Starts

Why the Steam Feeder Needs Water

Does Add Mean the Dryer Is Not Heating?

Does Add Mean the Steam Feeder Is Broken?

Add Appears Only on Steam Cycles

Should You Use Distilled Water?

If the Add Message Returns

When to Call a Professional Technician

Key Point

AE — Compressor Error

What Does the AE Error Code Mean?

Common Cause

What You Can Check

AE Does Not Have One Universal Resistance Specification

Example 1: 240V Inverter BLDC Compressor

Example 2: 120VAC Reciprocating Compressor

Example: LG DLHX4072

Why Compressor Winding Resistance Is Checked

Why Compressor Voltage Is Checked

Does AE Automatically Mean the Compressor Is Bad?

Does AE Apply to Every LG Dryer?

AE on LG Washer vs. LG Dryer

If the AE Error Returns

LG REFRIGERATOR
ERROR CODES

LG WASHER
ERROR CODES

LG DRYER
ERROR CODES

LG OVEN & RANGE
ERROR CODES

LG DISHWASHER
ERROR CODES