LG Refrigerator Error Codes &
Troubleshooting Guide
Find your LG refrigerator error code and learn what it means, what may be causing it, and which components or systems may need attention. Explore common cooling, fan, defrost, sensor, ice maker, and control system fault codes with practical troubleshooting 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
On This Page
- How LG Refrigerator Error Codes Work
- What an Error Code Can Tell You
- Error Code vs. Failed Part
- Why Error Codes Vary by Model
- What to Do When a Code Appears
- Can You Clear an Error Code?
- When to Call a Professional
- Find Your LG Refrigerator Error Code
- CF – Condenser Fan Error
- CH – Sealed System High-Side Error
- CL – Sealed System Low-Side Error
- CO – Communication Error
- CO2 — Display PCB / Dispenser PCB Communication Error
- CS – Communication / Sensor Error
- dH – Defrost Heater Error
- dS – Defrost Sensor Error
- EAd – Auto Door Error
- EAS — Auto Door Reed Switch Error
- EbU – Bottom Unit / Module Error
- EC1 – Communication Error
- EFE — No Stored Error (Not an Error Code)
- Edr – Drawer Error
- EFE – Freezer Evaporator Fan Error
- EFU — No Stored Error (Not an Error Code)
- ErU — No Stored Error (Not an Error Code)
- Ett – Water Tank Switch Error
- FF – Freezer Fan Error
- FS – Freezer Sensor Error
- gF – Flow Meter Error
- HS – Humidity Sensor Error
- IC — Mini Cubed Ice Maker Motor Error
- Id – Ice Maker / Ice Detection Error
- IE — Freezer Ice Maker Error
- IF – Ice Maker Fan Error
- IH – Ice Maker Heater Error
- IO — Mini Cubed Ice Maker Temperature Sensor Error
- IS – Ice Maker Sensor Error
- It — In-Door Ice Maker Kit Error
- IU – Ice Maker Error
- Rotary Knob – Rotary Knob / Display Control
- LAS — Left Auto Drawer Reed Switch Error
- Od – Wi-Fi Modem / Communication Error
- OFF – Cooling Off / Demo Mode
- PS – Pantry Sensor Error
- rAS — Right Auto Drawer Reed Switch Error
- rF – Refrigerator Fan Error
- rS – Refrigerator Sensor Error
- rS2 – Refrigerator Sensor 2 Error
- rt – Room Temperature Sensor Error
- Sb – Sabbath Mode
- SC – Communication Error
- Sd – Pantry / Drawer Sensor Error
- SF – Refrigerator Temperature Compensation Mode
- Sr — Refrigerator Temperature Compensation Mode
- SS – Pantry Sensor Error
- SSt – System / Sensor Error
- toc – Display / Touch Control Error
- UC – Communication Error
- UP – Software Update / Update Mode
Understanding LG Refrigerator Error Codes
Modern LG refrigerators use electronic control boards, temperature sensors, fans, motors, switches, and other components to monitor how the appliance is operating. When the control system detects an abnormal condition, it may display an error code on the refrigerator control panel.
Depending on the model, an LG refrigerator error code may point to a problem involving the cooling system, evaporator or condenser fan, defrost system, temperature sensors, ice maker, communication circuits, or other components.
The code can provide an important starting point for troubleshooting, but it should not always be interpreted as confirmation that a particular part has failed.
For example, a fan-related error may be caused by a failed fan motor, but it can also appear when the fan is blocked by ice, a wiring connection is damaged, or the control board does not receive the expected feedback signal.
Understanding what the code represents can help narrow down the system that needs to be checked.
How LG Refrigerator Error Codes Work
The main control board continuously receives information from different components throughout the refrigerator.
Depending on the model, the control system may monitor:
- refrigerator and freezer temperatures
- evaporator fan operation
- condenser fan operation
- defrost sensors and heaters
- ice maker components
- door and drawer switches
- compressor operation
- communication between electronic modules
When the control board receives a signal outside the expected operating range—or fails to receive an expected signal—it may store or display an error code.
Some codes appear immediately, while others may only appear after the refrigerator has attempted to operate a component several times.
This is why an error code should generally be viewed as diagnostic information about a system or condition, rather than an automatic instruction to replace a specific component.
What an LG Refrigerator Error Code Can Tell You
An error code can significantly narrow the troubleshooting process.
For example, different codes may indicate that the refrigerator has detected an issue involving:
Cooling and airflow
Problems involving evaporator fans, condenser fans, or other components responsible for moving air through the refrigerator.
Defrost system
Conditions involving the defrost heater, temperature sensing, frost accumulation, or related circuitry.
Temperature sensors
Abnormal readings or communication problems involving thermistors used to monitor refrigerator and freezer temperatures.
Ice maker system
Faults involving ice maker motors, fans, sensors, or related components.
Communication and electronics
Problems with communication between control boards, display modules, or other electronic components.
Knowing which system generated the code makes it possible to focus the diagnosis instead of checking unrelated refrigerator components.
An Error Code Does Not Always Mean a Part Has Failed
This is one of the most important things to understand when diagnosing an LG refrigerator.
Suppose the refrigerator displays a code associated with an evaporator fan.
The fan motor itself may have failed, but other possibilities can include:
- ice preventing the fan blade from turning
- damaged wiring
- a loose electrical connector
- insufficient voltage reaching the motor
- a feedback signal problem
- a control board fault
Similarly, a sensor error does not automatically mean the sensor itself needs replacement. Wiring, connectors, or the control circuit can sometimes produce the same symptom.
For this reason, replacing a component based only on the displayed code can lead to unnecessary repairs.
Why LG Refrigerator Error Codes Can Vary by Model
Not every LG refrigerator uses exactly the same diagnostic system.
Error codes can vary depending on the refrigerator’s:
- model and production series
- control board design
- door configuration
- ice maker system
- compressor and cooling system
- installed sensors and electronic features
Some codes may therefore appear only on certain models.
The same general code may also have slightly different diagnostic procedures depending on the refrigerator design.
When troubleshooting a specific refrigerator, the model number is important because it helps identify the correct technical information and component configuration.
Related guide: How to Find Your Refrigerator Model Number →
What to Do When an Error Code Appears
First, record the code exactly as it appears on the display.
Pay attention to similar-looking characters. Depending on the display, numbers and letters such as 1, I, 5, S, 0, and O can sometimes look alike.
Next, consider what the refrigerator was doing when the code appeared.
Useful clues include:
- refrigerator or freezer becoming too warm
- unusual fan noise
- heavy frost buildup
- ice maker stopping
- water or ice dispenser problems
- repeated clicking or cycling
- error appearing after a power interruption
These symptoms can provide additional context for the code.
You can then locate the code in the LG Refrigerator Error Code Lookup below to see its general meaning and the systems that may need to be inspected.
Can You Clear an LG Refrigerator Error Code?
Some error codes may disappear after the condition that caused them is corrected. Others can remain displayed until the refrigerator completes another diagnostic check or is restarted.
Disconnecting power may temporarily clear certain codes, but this does not necessarily fix the underlying problem.
If the same code returns after the refrigerator resumes operation, the condition that triggered it is likely still present.
Repeatedly resetting the refrigerator can also remove useful diagnostic information without solving the fault.
Related guide: How to Reset an LG Refrigerator Error Code →
When an Error Code Requires Professional Diagnosis
Some refrigerator problems can be investigated with basic checks, such as looking for blocked vents, visible frost accumulation, or an obstructed fan.
Other faults require electrical measurements, component testing, or sealed-system diagnosis.
Professional diagnosis may be appropriate when:
- the same error code repeatedly returns
- the refrigerator is no longer cooling properly
- the compressor is not operating normally
- a fan cannot operate despite being unobstructed
- wiring or electronic control problems are suspected
- the refrigerator develops heavy frost repeatedly
- a sealed-system or refrigerant problem is suspected
Electrical and sealed-system repairs should generally be performed with the appropriate diagnostic equipment and technical knowledge.
Find Your LG Refrigerator Error Code
LG refrigerator fault codes can provide valuable clues, but the code is only one part of the diagnosis. The refrigerator’s symptoms, model, operating conditions, and component test results may all be necessary to determine the actual cause.
Find the code displayed on your refrigerator below to see what it means, common possible causes, and the next troubleshooting steps. →
CF — Condenser Fan Error
The CF error code on an LG refrigerator indicates a problem with the condenser fan motor or its feedback signal. This fan is located in the machine compartment near the compressor and condenser and helps remove heat from the refrigeration system.
LG states that the CF code can appear when the control does not receive the expected feedback from the condenser fan while it is operating. A failed fan motor is a common cause, but disconnected wiring or a main control board problem can produce the same error.
Common Causes
Possible causes include:
- condenser fan motor failure
- fan blade blocked by debris or an obstruction
- damaged or disconnected wiring
- loose electrical connector
- fan feedback signal problem
- main control board fault
If the fan cannot move air across the condenser area, heat removal becomes less effective and the refrigerator may have difficulty maintaining normal temperatures. LG notes that a blocked or failed condenser fan can increase the load on the compressor and reduce cooling performance.
What You Can Check
Before scheduling service:
- Listen for the condenser fan. When the compressor is running, check whether you can hear airflow or fan operation from the lower rear area of the refrigerator.
- Check for obvious obstructions. If the fan area is safely accessible without removing protected electrical components, look for dust, debris, or another object preventing the blade from turning.
- Check refrigerator cooling. Notice whether the refrigerator or freezer temperature has started rising.
- Power-cycle the refrigerator. LG recommends disconnecting power for about 5 minutes and then restarting the refrigerator. If the underlying problem remains, the CF code may return.
If the CF Code Returns
If CF returns after a reset, the condenser fan system should be diagnosed.
A technician may need to:
- verify that the fan receives the correct power
- test condenser fan motor operation
- inspect the fan feedback circuit
- check wiring and connectors
- determine whether the main control board is correctly operating and monitoring the fan
LG recommends professional inspection when the CF error persists.
Related guide: Refrigerator Not Cooling? Common Causes and What to Check →
CH — Sealed System High-Side Error
The CH error code on an LG refrigerator indicates that the refrigerator has detected an abnormal condition on the high-pressure side of the sealed refrigeration system.
The high side includes components that handle hot, high-pressure refrigerant after it leaves the compressor. Depending on the refrigerator model and operating conditions, the code can be associated with excessive pressure, restricted refrigerant flow, poor heat dissipation, or another sealed-system condition.
Common Causes
Possible causes include:
- restricted refrigerant flow
- restriction in the condenser or sealed-system tubing
- poor airflow around the condenser
- condenser fan problem
- excessive refrigerant charge
- contamination or moisture inside the sealed system
- compressor or sealed-system malfunction
- abnormal pressure detected during operation
Because several different conditions can affect refrigerant pressure, the CH code alone does not identify which component has failed.
What You Can Check
There are only a few useful checks that can be performed without sealed-system equipment:
- Check refrigerator temperatures. Determine whether the refrigerator or freezer is becoming warmer than normal.
- Check ventilation. Make sure the refrigerator has adequate clearance and that exterior ventilation openings are not blocked.
- Listen for the condenser fan. If your model uses an accessible condenser fan, abnormal or absent fan operation may contribute to poor heat removal.
- Check for excessive heat. Unusually high temperatures around the compressor or condenser area may indicate that the refrigeration system is having difficulty rejecting heat.
- Restart the refrigerator. Disconnect power for approximately five minutes, then restore power and monitor whether the CH code returns.
Do not open refrigerant lines or attempt to release refrigerant to clear the error.
If the CH Code Returns
If the CH error returns, the sealed refrigeration system may require professional diagnosis.
A technician may need to:
- measure sealed-system pressures
- evaluate condenser airflow
- inspect the condenser and refrigerant tubing for restrictions
- verify compressor operation
- check the refrigerant charge
- determine whether contamination or another internal restriction is present
Sealed-system diagnosis requires specialized equipment, and the exact troubleshooting procedure can vary by LG refrigerator model.
If the refrigerator is also not cooling properly, continued operation with an abnormal sealed-system condition may place additional stress on the compressor.
Related guide: Refrigerator Not Cooling? Common Causes and What to Check →
CL — Sealed System Low-Side Error
The CL error code on an LG refrigerator indicates an abnormal condition involving the low-pressure side of the sealed refrigeration system.
The low side carries low-pressure refrigerant back toward the compressor after it has passed through the evaporator. A problem affecting refrigerant flow, system pressure, or compressor operation can prevent the refrigeration system from operating within its expected range.
Common Causes
Possible causes include:
- low refrigerant charge
- refrigerant leak
- restricted refrigerant flow
- restriction in the evaporator or return line
- capillary tube or metering-device restriction
- compressor performance problem
- contamination or moisture inside the sealed system
- abnormal sealed-system pressure
The CL code does not necessarily mean that one specific component needs to be replaced. Proper diagnosis requires evaluating the refrigeration system as a whole.
What You Can Check
Most causes of a CL error require sealed-system testing, but a few basic observations can provide useful information:
- Check refrigerator temperatures. See whether the fresh-food or freezer compartments are warmer than normal.
- Listen for the compressor. Note whether it runs continuously, cycles unusually, or does not appear to start.
- Check for frost patterns. Uneven or limited frost on the evaporator can sometimes accompany refrigerant-flow or sealed-system problems, although accessing the evaporator usually requires disassembly.
- Check for other symptoms. Poor cooling, unusually long compressor operation, or both compartments becoming warm can help narrow the diagnosis.
- Restart the refrigerator. Disconnect power for approximately five minutes, restore power, and check whether the CL code returns.
Do not attempt to add refrigerant, open refrigeration lines, or assume that low refrigerant is automatically the cause.
If the CL Code Returns
If the CL error returns, professional sealed-system diagnosis is usually required.
A technician may need to:
- measure high- and low-side pressures
- check for refrigerant leaks
- evaluate the refrigerant charge
- inspect for restrictions in the sealed system
- test compressor performance
- evaluate the evaporator frost pattern
- determine whether contamination or moisture is affecting refrigerant flow
If a refrigerant leak is found, simply adding refrigerant is not a complete repair. The source of the leak should be identified and corrected before the system is properly evacuated and recharged.
A CL error combined with poor or no cooling is a strong reason to have the refrigeration system professionally diagnosed.
Related guide: Refrigerator Not Cooling? Common Causes and What to Check →
CO — Communication Error
The CO error code on an LG refrigerator indicates a communication problem between the main control board and the display PCB. The refrigerator’s main board is not communicating normally with the display electronics. LG notes that the code may sometimes appear because of an unstable power supply or another temporary electrical condition.
Common Causes
Possible causes include:
- loose or disconnected wiring
- damaged wiring between the main board and display
- poor connection at an electrical connector
- main control board failure
- display PCB failure
- temporary power or electrical disturbance
Because the communication circuit includes multiple components and connections, the CO code does not automatically mean that either control board needs to be replaced.
What You Can Check
- Restart the refrigerator. Disconnect the refrigerator from power for approximately 5 minutes, then restore power. This is LG’s recommended first step for the CO error.
- Check whether the code returns. A temporary electrical condition may disappear after the power reset.
- Check display operation. Note whether the display responds normally or shows other unusual behavior.
- Look for other symptoms. Cooling problems, intermittent display operation, or controls that stop responding can provide additional diagnostic information.
Internal wiring and control-board testing generally requires refrigerator disassembly and electrical measurements.
If the CO Code Returns
If CO returns after the reset, the communication circuit should be diagnosed.
A technician may need to:
- inspect connectors at the main and display boards
- check wiring through the refrigerator cabinet and door
- test continuity of the communication lines
- verify the required voltages
- evaluate the main control board
- evaluate the display PCB
Technical diagnostic information for LG refrigerators specifically calls for checking the Rx/Tx communication linesbetween the main PCB and display PCB when diagnosing this fault.
LG recommends service if the CO code continues to appear after the power reset.
CO2 — Communication Error 2
The CO2 error code on an LG refrigerator indicates a communication failure between the Display PCB and the Dispenser PCB. The code appears when the refrigerator’s electronic controls cannot properly exchange data between these two boards.
This is an electronic communication fault rather than a cooling-system error. The refrigerator may continue cooling normally while some display or dispenser functions operate incorrectly.
Common Causes
Possible causes include:
- loose or disconnected wiring between the Display PCB and Dispenser PCB
- damaged communication wiring
- poor connection at an electrical connector
- damaged wiring in or around the refrigerator door
- connection problem near the door hinge
- faulty Display PCB
- faulty Dispenser PCB
- communication circuit problem
The CO2 code does not automatically mean that either PCB needs to be replaced. Wiring and connections should be checked before replacing electronic components.
What You Can Check
- Check the display. Note whether the display is blank, flickering, unresponsive, or behaving unusually.
- Check the dispenser. Determine whether water, ice dispensing, and dispenser controls operate normally.
- Watch for intermittent operation. If the problem changes when the refrigerator door is opened or closed, wiring or a connector in the door/hinge area may be involved.
- Record additional error codes. Other communication codes can provide useful information about the affected circuit.
- Restart the refrigerator. Disconnect power for approximately five minutes, restore power, and check whether CO2 returns.
Avoid removing electronic panels or testing energized control circuits unless you are qualified to perform electrical diagnostics.
If the CO2 Code Returns
If CO2 continues to appear, the communication circuit between the Display PCB and Dispenser PCB should be diagnosed.
A technician may need to:
- inspect connectors at both PCBs
- inspect the communication wiring
- check wiring through the door and hinge area
- test wiring continuity
- verify power and ground to the control boards
- check communication signals between the boards
- evaluate the Display PCB
- evaluate the Dispenser PCB
Because wiring layouts and PCB configurations vary between LG refrigerator models, the exact connector locations and electrical measurements should be verified using service information for the specific model.
A persistent CO2 code primarily indicates an electronic communication problem and does not by itself indicate a compressor, sealed-system, or refrigeration failure.
CS — Cycle Error
The CS error code on an LG refrigerator indicates a cycle error detected during the refrigerator’s LQC (quality-control/diagnostic) operating mode. The condition occurs when the control does not see the expected temperature drop at the defrost sensor within the required time.
Unlike many common refrigerator fault codes, CS is closely related to diagnostic testing and can point toward either a temperature-sensing problem or inadequate cooling performance.
Common Causes
Possible causes include:
- defective defrost sensor
- defrost sensor reading outside the expected range
- weak or abnormal evaporator frost pattern
- sealed-system problem
- insufficient refrigeration performance
- wiring or connection problem in the sensor circuit
The code does not automatically mean the defrost sensor needs to be replaced. A refrigerator with a weak cooling system may also fail to reach the temperature expected during the test and generate the CS condition.
What You Can Check
- Check refrigerator and freezer temperatures. Determine whether either compartment is warmer than normal.
- Look for other cooling symptoms. Long compressor run times, poor freezer performance, or food not remaining properly frozen may indicate a broader refrigeration problem.
- Check for unusual frost conditions. An abnormal evaporator frost pattern can provide important diagnostic information, although accessing the evaporator generally requires disassembly.
- Restart the refrigerator if appropriate. If the code appeared during diagnostic testing, determine whether it returns during another test or normal operation.
If the CS Code Returns
If CS continues to appear, the defrost sensor and cooling system should be diagnosed rather than replacing parts based on the code alone.
A technician may need to:
- test the defrost sensor
- compare sensor readings with expected specifications
- inspect sensor wiring and connections
- evaluate the evaporator frost pattern
- verify cooling performance
- diagnose the sealed refrigeration system if the frost pattern is weak
LG technical information describes the CS cycle error as occurring when the defrost sensor temperature fails to drop below approximately 3.5°C (38.3°F) within 10 minutes after the LQC test begins. A weak frost pattern can indicate a sealed-system issue that prevents the refrigerator from reaching the required temperature.
Related guide: Refrigerator Not Cooling? Common Causes and What to Check →
dH — Defrost System Error
The dH error code on an LG refrigerator indicates a defrost system failure. The refrigerator started a defrost cycle but did not detect the expected temperature change within the required amount of time. LG may also display this fault as FdH, dHF, Er dH, or E dH, depending on the model.
During normal operation, frost forms on the evaporator. The defrost system periodically melts this frost so that air can continue moving through the evaporator and refrigerator compartments.
Common Causes
Possible causes include:
- excessive frost or ice buildup
- failed defrost heater
- blown thermal fuse
- defrost sensor or temperature-sensing problem
- blocked or frozen drain
- damaged wiring or loose connection
- main control board problem
LG specifically identifies ice accumulation, thermal-fuse failure, heater failure, blocked drainage, and PCB problems as possible causes of a defrost fault.
What You Can Check
- Check for frost buildup. Heavy frost on the freezer’s rear interior panel can indicate that the evaporator is not defrosting normally.
- Check refrigerator temperatures. A defrost failure can eventually restrict airflow and cause the refrigerator or freezer to become warmer.
- Look for ice around the drain area. On applicable models, a frozen or blocked defrost drain can interfere with normal defrost operation.
- Note whether the code returns. A reset may clear the display temporarily, but it will not repair a failed heater, sensor, fuse, wiring connection, or control.
Avoid using sharp objects or excessive heat to remove ice from the evaporator area, as this can damage internal components or refrigerant tubing.
If the dH Code Returns
If dH returns, the defrost system should be diagnosed.
A technician may need to:
- test the defrost heater
- test the defrost sensor
- check the thermal fuse
- inspect wiring and connectors
- inspect the evaporator for abnormal frost buildup
- check the defrost drain
- verify that the main control board is activating the defrost circuit
LG recommends professional inspection for a persistent dH/FdH/dHF defrost fault.
A defrost problem that remains unresolved can eventually restrict evaporator airflow and lead to poor refrigerator cooling.
Related guide: Refrigerator Not Cooling? Common Causes and What to Check →
dS — Defrost Sensor Error
The dS error code on an LG refrigerator indicates a problem with the defrost temperature sensor circuit. LG identifies this fault as a short circuit or disconnection involving the defrost sensor. Depending on the model, the display may show variations such as F dS or r dS.
The defrost sensor monitors evaporator temperature and provides information the control board uses during normal cooling and automatic defrost operation. If the control cannot receive a valid signal from this sensor, normal defrost operation may be affected.
Common Causes
Possible causes include:
- failed defrost temperature sensor
- sensor circuit short
- open sensor circuit
- damaged or disconnected wiring
- loose or corroded electrical connector
- damaged wiring near the evaporator
- main control board problem
The dS code does not automatically mean the sensor itself has failed. The wiring and connections between the sensor and control board are part of the same monitored circuit.
F dS vs. r dS
On models that distinguish between multiple evaporator systems, LG may display different versions of the code:
- F dS — problem with the freezer defrost sensor
- r dS — problem with the refrigerator defrost sensor
The exact code format and sensor configuration depend on the refrigerator model.
What You Can Check
- Record the exact code. Note whether the refrigerator displays
dS,F dS,r dS, or another variation. - Check refrigerator temperatures. A defrost sensor problem can eventually contribute to cooling and airflow problems.
- Look for excessive frost. Heavy frost around the evaporator area or rear interior panel can indicate that normal defrost operation has been affected.
- Check for other symptoms. Reduced airflow, increasing compartment temperatures, or repeated frost accumulation can provide additional diagnostic clues.
LG recommends professional inspection for a dS sensor fault rather than component-level troubleshooting by the user.
If the dS Code Returns
If dS continues to appear, the defrost sensor circuit should be diagnosed.
A technician may need to:
- measure defrost sensor resistance
- compare the reading with the expected temperature/resistance specification
- inspect the sensor connector
- check wiring continuity
- look for damaged or shorted wiring
- inspect the evaporator and frost pattern
- verify the sensor input at the main control board
A persistent dS fault can interfere with proper defrost operation and may eventually contribute to ice buildup, restricted airflow, and poor cooling. LG notes that a defrost-sensor fault can allow the evaporator to become blocked by ice.
Related guide: Refrigerator Not Cooling? Common Causes and What to Check →
EAd — Auto Door Module Error
The EAd error code on an LG refrigerator indicates a problem with the Auto Door module found on certain LG refrigerator models. The fault can involve the Auto Door motor, its Hall sensor, or the electrical connection between the Auto Door module and the refrigerator’s control system.
The Auto Door system uses a motorized mechanism to assist with opening the refrigerator door. The control needs feedback from the mechanism to determine whether the door movement occurred correctly.
Common Causes
Possible causes include:
- Auto Door motor failure
- Hall sensor problem
- obstruction preventing normal door movement
- damaged or disconnected wiring
- loose electrical connector
- Auto Door module connection problem
- main control board problem
The EAd code does not automatically mean that the entire Auto Door module needs to be replaced. The motor, position feedback, wiring, and connections are all part of the system monitored by the control.
What You Can Check
- Check for an obstruction. Make sure nothing is physically preventing the Auto Door mechanism or refrigerator door from moving normally.
- Check door operation. Note whether the Auto Door feature works at all, operates intermittently, or begins moving and then stops.
- Record any unusual sounds. Clicking, repeated attempts to move, or motor noise without normal door movement can provide useful diagnostic information.
- Restart the refrigerator. Disconnect power for approximately five minutes, restore power, and check whether EAd returns.
Do not force the motorized mechanism if it appears jammed.
If the EAd Code Returns
If EAd continues to appear, the Auto Door system should be diagnosed.
A technician may need to:
- inspect the Auto Door mechanism for mechanical obstruction
- test the Auto Door motor
- verify Hall sensor feedback
- inspect wiring and connectors
- check power and control signals to the Auto Door module
- evaluate the main control board if the module and wiring test normally
Because the Auto Door feature is only installed on certain LG refrigerator models, the exact diagnostic procedure should be based on the refrigerator’s model-specific service information. Technical error-code documentation identifies EAd specifically as an Auto Door Module Problem involving the Hall sensor, motor, or module connection.
EAS — Auto Door Reed Switch Error
The EAS error code on an LG refrigerator indicates a problem with the Auto Door reed switch system on models equipped with LG’s automatic door-opening feature.
The reed switch is used to detect the position or operation of the Auto Door mechanism. If the refrigerator does not receive the expected signal from this switch, the EAS code may appear.
Common Causes
Possible causes include:
- failed Auto Door reed switch
- loose or disconnected reed switch connector
- damaged or broken wiring
- reed switch and magnet misalignment
- Auto Door mechanism not reaching the expected position
- mechanical obstruction affecting door movement
- poor electrical connection
- control circuit problem
The EAS code does not automatically mean that the Auto Door motor or complete Auto Door module needs to be replaced. The reed switch, its connection, and mechanical alignment should be checked first.
What You Can Check
- Check Auto Door operation. Determine whether the automatic door-opening feature works normally or stops before completing its movement.
- Check for obstructions. Make sure nothing is interfering with normal door movement.
- Check door alignment. A door or mechanism that does not reach its expected position may prevent the reed switch from activating correctly.
- Listen for unusual operation. Repeated attempts to operate the Auto Door can indicate that the control is not detecting the expected position.
- Restart the refrigerator. Disconnect power for approximately five minutes, restore power, and check whether EAS returns.
Do not force the automatic door mechanism if it appears jammed.
If the EAS Code Returns
If EAS continues to appear, the Auto Door reed switch circuit should be diagnosed.
A technician may need to:
- inspect the Auto Door reed switch
- verify reed switch and magnet alignment
- test reed switch operation
- inspect the switch connector
- check wiring for open or damaged circuits
- test wiring continuity
- verify the switch signal at the control board
- inspect the Auto Door mechanism for mechanical problems
Because the Auto Door feature is only available on certain LG refrigerator models, the exact switch location, wiring, and diagnostic procedure should be verified using service information for the specific model.
The EAS code specifically points to the Auto Door reed switch circuit, while other Auto Door codes may identify motor, Hall sensor, or module-related problems.
EbU — Bottom Unit Error
The EbU error code on an LG refrigerator indicates a problem involving the Bottom Unit (BU) system used on certain LG refrigerator models. The control has detected abnormal operation or an unexpected signal from the bottom-unit mechanism.
Because this system is only present on specific refrigerator designs, the exact components and diagnostic procedure can vary by model.
Common Causes
Possible causes include:
- Bottom Unit motor or actuator problem
- mechanism blocked or unable to move normally
- position or Hall sensor problem
- damaged wiring
- loose or disconnected electrical connector
- Bottom Unit module problem
- main control board or communication problem
The EbU code does not automatically mean the complete Bottom Unit assembly has failed. A mechanical restriction or loss of position feedback can produce the same general fault.
What You Can Check
- Check for an obstruction. Make sure nothing is preventing the applicable drawer or Bottom Unit mechanism from moving normally.
- Check mechanical operation. Note whether the mechanism moves normally, stops partway, or does not operate at all.
- Listen for unusual sounds. Repeated clicking, grinding, or motor operation without movement may indicate a mechanical restriction.
- Restart the refrigerator. Disconnect power for approximately five minutes, restore power, and check whether EbU returns.
- Record the model number. This is particularly important for EbU because the Bottom Unit system and diagnostic procedure are model-specific.
Do not force a motorized mechanism that appears jammed.
If the EbU Code Returns
If EbU continues to appear, the Bottom Unit system should be diagnosed using the service information for the exact LG refrigerator model.
A technician may need to:
- inspect the mechanism for binding or obstruction
- test the motor or actuator
- verify position-sensor feedback
- inspect wiring and connectors
- check power and control signals
- evaluate the Bottom Unit module
- verify communication with the main control board
Because EbU is a model-specific error associated with specialized LG refrigerator hardware, identifying the exact model is important before replacing any component.
EC1 — LCD Display–Dispenser Communication Error
The EC1 error code on an LG refrigerator indicates a communication problem between the LCD display and the dispenser control system. LG technical documentation describes EC1 as a communication connection or transmit/receive fault in this circuit.
The display and dispenser electronics exchange information through wiring and connectors. If that communication is interrupted or the expected signals are not received, the refrigerator can display EC1.
Common Causes
Possible causes include:
- loose electrical connection
- disconnected wiring harness
- damaged communication wiring
- poor connection near the door hinge
- damaged or corroded connector
- LCD/display control problem
- dispenser control problem
- power or communication-signal problem
A model-specific LG service manual specifically includes checking loose connections and the hinge connection when diagnosing EC1.
The code therefore does not automatically mean that a control board needs to be replaced.
What You Can Check
- Check the display and dispenser. Note whether the display responds normally and whether the water and ice dispenser functions operate.
- Look for intermittent operation. A display or dispenser that works when the door is moved can be an important clue to a wiring or hinge-area connection problem.
- Check for other unusual behavior. Flickering controls, unresponsive buttons, or intermittent dispenser operation can help identify the affected circuit.
- Restart the refrigerator. Disconnect power for approximately five minutes, restore power, and check whether EC1 returns.
Avoid removing electronic panels or testing energized circuits unless you are qualified to perform electrical diagnostics.
If the EC1 Code Returns
If EC1 continues to appear, the communication circuit should be diagnosed.
A technician may need to:
- inspect display and dispenser connectors
- inspect wiring through the door and hinge area
- check wiring continuity
- verify power supplied to the electronic modules
- test communication transmit/receive signals
- evaluate the display electronics
- evaluate the dispenser control electronics
Because wiring arrangements and control-board configurations vary between LG refrigerator models, the exact test points should be taken from the service information for the specific model.
LG maintains an official support entry specifically for the EC1 refrigerator error code, while LG technical error-code documentation identifies the fault as an LCD display-to-dispenser communication problem.
EdL — Left Auto Drawer Motor Error
The EdL error code on an LG refrigerator indicates a problem with the left Auto Drawer motor system. On models equipped with the automatic drawer feature, the code is triggered when the left Auto Drawer motor fails to reach its maximum position or home position within 5 seconds.
The system relies on the drawer motor and Hall sensor feedback to determine whether the drawer has moved to the expected position.
Common Causes
Possible causes include:
- left Auto Drawer motor failure
- defective or abnormal Hall sensor
- loose motor or sensor connection
- damaged or disconnected wiring
- mechanical obstruction preventing drawer movement
- drawer mechanism binding or jamming
- Auto Drawer module connection problem
- Auto Drawer module failure
The EdL code does not automatically mean that the motor needs to be replaced. The LG technical reference specifically recommends checking the left Hall sensor, motor, and Auto Drawer module for proper connection and operation.
What You Can Check
- Check the left drawer for obstructions. Make sure food containers or other objects are not preventing normal movement.
- Check drawer movement. Note whether the drawer moves fully, stops partway, or does not move at all.
- Listen for the motor. Motor noise without normal drawer movement may indicate binding or a mechanical problem.
- Do not force the drawer. Forcing a jammed motorized drawer may damage the drive mechanism.
- Restart the refrigerator. Disconnect power for approximately five minutes, restore power, and check whether EdL returns.
If the EdL Code Returns
If EdL continues to appear, the left Auto Drawer system should be diagnosed.
A technician may need to:
- inspect the drawer mechanism for binding
- test the left Auto Drawer motor
- verify Hall sensor operation and feedback
- inspect motor and sensor connections
- check wiring and connectors
- verify that the drawer can reach its home and maximum positions
- inspect the Auto Drawer module
- evaluate the module’s control of the motor
Because the Auto Drawer system is only found on certain LG refrigerator models, the exact electrical tests and component locations should be verified using service information for the specific model.
EdL specifically identifies the left Auto Drawer motor system and should not be described simply as a generic door or drawer lock error.
Edr — Right Auto Drawer Module Error
The Edr error code on an LG refrigerator indicates a problem with the right Auto Drawer module on models equipped with LG’s motorized Auto Drawer system.
The Auto Drawer mechanism uses a motor and position feedback to control drawer movement. If the refrigerator cannot operate the right drawer normally or does not receive the expected feedback signal, the Edr code may appear.
Common Causes
Possible causes include:
- right Auto Drawer motor failure
- Hall sensor or position-feedback problem
- drawer movement blocked or restricted
- damaged or jammed drawer mechanism
- loose electrical connector
- damaged or disconnected wiring
- Auto Drawer module connection problem
- electronic control problem
The Edr code does not necessarily mean the complete Auto Drawer assembly needs to be replaced. A mechanical obstruction, motor problem, sensor fault, or electrical connection can prevent the control from detecting normal drawer movement.
What You Can Check
- Check for obstructions. Make sure food containers or other items are not interfering with the movement of the right drawer.
- Check drawer movement. Observe whether the drawer moves normally, stops partway, or does not move at all.
- Listen for unusual sounds. Clicking, grinding, or a motor running without drawer movement may indicate a mechanical restriction or drive problem.
- Do not force the drawer. Forcing a jammed motorized drawer can damage the mechanism.
- Restart the refrigerator. Disconnect power for approximately five minutes, restore power, and check whether the Edr code returns.
If the Edr Code Returns
If Edr continues to appear, the right Auto Drawer system should be diagnosed.
A technician may need to:
- inspect the drawer mechanism for binding or damage
- test the Auto Drawer motor
- verify Hall sensor feedback
- inspect wiring and electrical connectors
- check the Auto Drawer module connection
- verify power and control signals
- evaluate the electronic control system if the drawer components test normally
Because the Auto Drawer feature is only found on certain LG refrigerator models, the exact components and diagnostic procedure should be verified using service information for the specific model.
EdL and Edr identify opposite sides of the Auto Drawer system: EdL applies to the left Auto Drawer, while Edrapplies to the right Auto Drawer.
EFE — No Stored Error (Not an Error Code)
The EFE display is not an LG refrigerator error code. It is a factory/service diagnostic message that can appear when checking the refrigerator for stored error codes.
When EFE is displayed, it means that no error code is currently stored in the refrigerator’s diagnostic memory. It does not identify a failed component and does not indicate a problem with the freezer evaporator fan.
What EFE Means
EFE may appear when:
- stored diagnostic codes are being retrieved
- a factory or service diagnostic procedure is being performed
- the refrigerator’s error history is being checked
- no stored fault is available to display
In this situation, EFE simply indicates that the diagnostic memory contains no stored error.
What You Should Do
If the refrigerator is operating normally and EFE appears only while accessing diagnostic information, no repair is required.
There is no need to replace the evaporator fan, sensor, control board, or another component based on EFE alone.
If the refrigerator has an actual problem—such as poor cooling, unusual noise, no ice production, or a dispenser malfunction—diagnose that specific symptom separately. The EFE message does not provide a fault diagnosis because no corresponding error is stored.
EFE vs. Fan Error Codes
EFE should not be confused with a freezer evaporator fan error. Despite the letters appearing to suggest “evaporator fan,” EFE is a diagnostic/service indication rather than a fan fault.
This distinction is important when interpreting LG refrigerator codes because not every combination shown on the display represents a component failure.
Note: EFE is a factory/service diagnostic message indicating no stored error, not an error code.
EFU — No Stored Error (Not an Error Code)
The EFU display is not an LG refrigerator error code. It is a factory/service diagnostic message that may appear when the refrigerator’s stored error information is being checked.
When EFU appears, it means that no error code is currently stored in the refrigerator’s diagnostic memory. It does not indicate a freezer fan, control board, sensor, or other component failure.
What EFU Means
EFU may appear when:
- stored error codes are being retrieved
- a factory or service diagnostic procedure is being performed
- the refrigerator’s error history is being checked
- no stored fault is available to display
In this situation, EFU simply indicates that no stored error was found.
What You Should Do
If the refrigerator is operating normally and EFU appears only during a diagnostic procedure, no repair or component replacement is required.
If the refrigerator has an actual problem—such as:
- poor cooling
- abnormal fan noise
- no ice production
- dispenser problems
- unstable temperatures
that symptom should be diagnosed separately. EFU itself does not identify the cause because there is no corresponding stored fault.
EFU vs. Fan Error Codes
EFU should not be interpreted as a freezer fan error. Although the letters may appear to suggest a fan-related abbreviation, EFU is a factory/service indication rather than a component fault.
This is also why EFE and EFU should remain separate entries in the Knowledge Center even though both indicate that no stored error is present: they can appear in different diagnostic contexts or LG refrigerator configurations.
Note: EFU is a factory/service diagnostic message indicating no stored error, not an error code.
ErU — No Stored Error (Not an Error Code)
The ErU display is not an LG refrigerator error code. It is a factory/service diagnostic message that may appear when stored error information is being retrieved from the refrigerator.
When ErU is displayed, it indicates that no error code is stored in the applicable diagnostic memory. It does not identify a refrigerator unit failure, sensor problem, fan fault, or other failed component.
What ErU Means
ErU may appear when:
- stored diagnostic errors are being checked
- a factory or service diagnostic procedure is being performed
- the refrigerator’s error history is being accessed
- no stored fault is available to display
In this situation, ErU simply indicates that no stored error was found.
What You Should Do
If the refrigerator is operating normally and ErU appears only while checking diagnostic information, no repair or component replacement is required.
There is no reason to replace a control board, sensor, fan, or other component based on ErU alone.
If the refrigerator has an actual symptom—such as poor cooling, abnormal temperatures, unusual noises, ice maker problems, or dispenser issues—diagnose that specific symptom separately. ErU itself does not provide a fault diagnosis.
ErU vs. Refrigerator Error Codes
ErU should not be interpreted as “Refrigerator Unit Error.” Despite how the abbreviation may appear, the technical reference identifies it as a factory/service indication rather than a component failure.
This distinction is important for EFE, EFU, and ErU: these display combinations can appear during diagnostic procedures but do not represent normal component error codes.
Note: ErU is a factory/service diagnostic message indicating no stored error, not an error code.
Ett — Water Tank Switch Error
The Ett error code on an LG refrigerator indicates a problem with the water tank switch system on models equipped with a removable or monitored water tank. Technical LG refrigerator error-code documentation defines Ett as a condition where the water tank is not assembled correctly or the water tank switch is not operating properly.
The switch allows the refrigerator to detect whether the water tank is correctly installed. If the expected switch signal is not received, the refrigerator may display the Ett code.
Common Causes
Possible causes include:
- water tank not installed correctly
- water tank not fully seated
- obstruction preventing proper tank installation
- damaged or misaligned water tank
- defective water tank switch
- switch not being activated by the tank
- loose electrical connection
- damaged switch wiring
- control circuit problem
The Ett code does not automatically mean the switch needs to be replaced. Incorrect tank positioning can create the same condition.
What You Can Check
- Remove and reinstall the water tank. Make sure it is positioned correctly and fully seated in its normal location.
- Check for obstructions. Look for objects, debris, or misaligned parts that could prevent the tank from reaching its proper position.
- Inspect the tank. Check for visible damage or deformation that could prevent it from activating the switch correctly.
- Check related water functions. Note whether the water dispenser or other water-related features operate normally.
- Restart the refrigerator. Disconnect power for approximately five minutes, restore power, and check whether Ett returns.
Do not bypass or permanently hold the water tank switch in the activated position.
If the Ett Code Returns
If Ett continues to appear with the water tank correctly installed, the tank-detection system should be diagnosed.
A technician may need to:
- verify correct water tank alignment
- inspect the water tank switch
- test switch operation
- inspect the switch wiring and connectors
- verify continuity through the circuit
- check the switch input at the control board
- evaluate the electronic control if the switch and wiring test normally
Because the water tank system is only present on certain LG refrigerator models, the exact location of the switch and diagnostic procedure should be verified using information for the specific model.
FF — Freezer Fan Error
The FF error code on an LG refrigerator indicates a problem with the freezer evaporator fan. The control system has detected that the fan is not operating normally or is not providing the expected feedback signal.
The freezer fan moves cold air across the evaporator and circulates it through the freezer and, depending on the refrigerator design, other compartments. If the fan stops or becomes blocked, temperatures can gradually rise even though the compressor may continue running.
Common Causes
Possible causes include:
- frost or ice blocking the freezer fan
- failed freezer fan motor
- fan blade obstruction
- excessive frost around the evaporator
- defrost system problem
- loose or damaged electrical connector
- damaged fan wiring
- fan feedback signal problem
- main control board fault
On LG refrigerators, ice buildup around the fan is an important possibility. In this situation, the fan motor itself may still be functional, but accumulated frost prevents the blade from rotating normally.
What You Can Check
- Listen for the freezer fan. Buzzing, grinding, scraping, or clicking from the freezer can indicate that the fan blade is contacting ice.
- Check freezer temperature. Determine whether frozen food is becoming softer or the compartment is warmer than normal.
- Check refrigerator temperature. On models that use freezer airflow to cool the fresh-food compartment, a freezer fan problem can also cause the refrigerator section to become warm.
- Look for frost buildup. Heavy frost on the rear interior freezer panel may indicate a defrost problem that is also interfering with fan operation.
- Restart the refrigerator. Disconnect power for approximately five minutes, restore power, and check whether the FF code returns.
Keep in mind that many refrigerator models stop the evaporator fan while the door is open, so not hearing the fan with the door open does not necessarily indicate a failure.
Do not use knives or other sharp objects to remove ice around the evaporator or fan.
If the FF Code Returns
If FF continues to appear, the freezer fan system should be diagnosed.
A technician may need to:
- inspect the fan for ice or mechanical obstruction
- check the evaporator for excessive frost
- test the freezer fan motor
- verify voltage supplied to the fan
- check the fan feedback signal
- inspect wiring and connectors
- test the defrost system if frost is causing the obstruction
- evaluate the main control board if the fan circuit tests normally
If the fan is frozen because of an underlying defrost problem, simply replacing the fan motor will not correct the cause. The source of the frost accumulation also needs to be diagnosed.
A persistent FF error combined with poor cooling or heavy frost buildup should be addressed before refrigerator temperatures rise further.
Related guide: Refrigerator Not Cooling? Common Causes and What to Check →
FS — Freezer Sensor Error
The FS error code on an LG refrigerator indicates a problem with the freezer temperature sensor (thermistor) circuit. The main control board is receiving a freezer sensor signal that is outside the expected range, which can occur when the sensor circuit is open or shorted.
The freezer sensor monitors compartment temperature and sends this information to the control board so the refrigerator can regulate cooling. If the sensor signal becomes invalid, accurate freezer temperature control may be affected.
Common Causes
Possible causes include:
- failed freezer temperature sensor
- open sensor circuit
- shorted sensor circuit
- damaged or broken wiring
- loose electrical connector
- moisture or corrosion at a connection
- poor connection at the main control board
- main control board problem
The FS code does not automatically mean that the freezer sensor itself needs replacement. The sensor, connectors, wiring, and control-board input are all part of the monitored circuit.
What You Can Check
- Check freezer temperature. Determine whether the freezer is maintaining normal temperature or becoming unusually warm or cold.
- Look for other symptoms. Continuous compressor operation, unusual cycling, or unstable freezer temperatures can provide additional diagnostic clues.
- Record any additional codes. Multiple sensor or cooling-related errors may indicate a broader wiring or control problem.
- Restart the refrigerator. Disconnect power for approximately five minutes, restore power, and check whether the FS code returns.
Testing the freezer thermistor itself normally requires access to internal components and resistance measurements.
If the FS Code Returns
If FS continues to appear, the freezer sensor circuit should be diagnosed.
A technician may need to:
- measure freezer thermistor resistance
- compare resistance with the expected value for the measured temperature
- inspect the sensor connector
- check wiring for open or short circuits
- test wiring continuity between the sensor and control board
- inspect connectors for moisture or corrosion
- verify the sensor signal at the main control board
- evaluate the control board if the sensor and wiring test normally
Because a thermistor’s resistance changes with temperature, simply checking for continuity may not be sufficient. Its measured resistance should be compared with the correct temperature/resistance specification for the refrigerator model.
A persistent FS error can interfere with accurate freezer temperature regulation and should be diagnosed if it continues to return.
Related guide: Refrigerator Not Cooling? Common Causes and What to Check →
gF — Flow Meter Error
The gF error code on an LG refrigerator indicates a problem with the water flow meter or water-flow sensing system. On models equipped with a flow meter, the refrigerator uses this component to monitor the amount of water moving through the dispenser or ice-making water system.
If the control does not receive the expected flow-meter signal, or the measured water flow is outside the expected range, the gF code may appear.
Common Causes
Possible causes include:
- low household water pressure
- partially closed water supply valve
- kinked or restricted water supply line
- clogged or incorrectly installed water filter
- restricted water flow inside the refrigerator
- failed flow meter
- damaged or disconnected wiring
- loose electrical connector
- main control board problem
The gF code does not automatically mean that the flow meter has failed. A water-supply restriction can prevent the system from detecting the expected flow even when the electronic components are working correctly.
What You Can Check
- Check the water supply valve. Make sure the refrigerator’s household water valve is fully open.
- Inspect the water line. Look for kinks, bends, or other restrictions that could reduce water flow.
- Check dispenser flow. If the water dispenser is operating slowly, weak water pressure or a restriction may be contributing to the error.
- Check the water filter. An old, clogged, incorrectly installed, or incompatible filter can restrict water flow.
- Check ice maker operation. Note whether the ice maker is filling normally or producing smaller-than-normal ice cubes.
- Restart the refrigerator. Disconnect power for approximately five minutes, restore power, and check whether the gF code returns.
Avoid replacing the flow meter before confirming that the refrigerator has an adequate water supply.
If the gF Code Returns
If gF continues to appear after the water supply and filter have been checked, the water-flow sensing system should be diagnosed.
A technician may need to:
- verify household water pressure and flow
- inspect the refrigerator’s internal water lines
- check for restrictions in the filter or valve system
- test the water inlet valve
- test flow-meter operation
- verify the flow-meter signal
- inspect wiring and connectors
- evaluate the main control board if the water system and flow meter test normally
Because LG refrigerator water-system designs vary by model, the exact flow-meter specifications and diagnostic procedure should be verified using the service information for the specific refrigerator.
Related guide: Refrigerator Ice Maker Not Working? Common Causes and What to Check →
HS — Humidity Sensor Error
The HS error code on an LG refrigerator indicates a problem with the humidity sensor circuit. The humidity sensor monitors moisture conditions and provides information to the refrigerator’s electronic control system.
If the control receives a signal from the humidity sensor that is outside the expected range, or the sensor circuit becomes open or shorted, the HS code may appear.
Common Causes
Possible causes include:
- failed humidity sensor
- open sensor circuit
- shorted sensor circuit
- damaged or disconnected wiring
- loose electrical connector
- moisture or corrosion at a connection
- poor connection at the main control board
- main control board problem
The HS code does not automatically mean that the humidity sensor itself needs to be replaced. The sensor, wiring, connectors, and control-board input should be considered as parts of the same circuit.
What You Can Check
- Check for unusual moisture. Look for excessive condensation or moisture inside the refrigerator.
- Check door closure. Make sure the refrigerator doors close completely and nothing prevents the door gaskets from sealing properly.
- Inspect the door gaskets. Damaged, dirty, or poorly sealing gaskets can allow humid room air to enter the refrigerator.
- Note other symptoms. Excessive condensation, unusual temperature behavior, or additional sensor codes can provide useful diagnostic information.
- Restart the refrigerator. Disconnect power for approximately five minutes, restore power, and check whether the HS code returns.
A power reset may clear a temporary condition, but it will not correct a failed sensor or damaged sensor circuit.
If the HS Code Returns
If HS continues to appear, the humidity sensor circuit should be diagnosed.
A technician may need to:
- test the humidity sensor
- inspect the sensor connector
- check wiring for open or short circuits
- test wiring continuity
- inspect connectors for moisture or corrosion
- verify the sensor signal at the main control board
- evaluate the control board if the sensor and wiring test normally
Because the location and operation of the humidity sensor can vary between LG refrigerator models, testing should be performed using the specifications for the specific model.
A persistent HS error primarily indicates a sensor/circuit problem and does not by itself mean that the refrigerator’s sealed cooling system has failed.
IC — Mini Cubed Ice Maker Motor Error
The IC error code on an LG refrigerator indicates a problem with the Mini Cubed Ice Maker motor system. On models equipped with this ice maker, the control has detected that the motor or ice-making mechanism is not operating as expected.
The Mini Cubed Ice Maker uses a motorized mechanism to move the ice tray through the freezing and harvest process. If the motor cannot complete the required movement, or the control does not receive the expected position feedback, the IC code may appear.
Common Causes
Possible causes include:
- Mini Cubed Ice Maker motor failure
- ice tray or mechanism jammed by ice
- mechanical obstruction preventing movement
- damaged or binding ice maker mechanism
- Hall sensor or position-feedback problem
- loose electrical connector
- damaged or disconnected wiring
- ice maker control circuit problem
The IC code does not automatically mean that the entire ice maker assembly needs to be replaced. A mechanical obstruction, wiring problem, or loss of position feedback can prevent an otherwise functional motor from completing its cycle.
What You Can Check
- Check for jammed ice. Look for ice cubes or frost that may be preventing the Mini Cubed Ice Maker mechanism from moving normally.
- Check ice production. Determine whether mini cubed ice production has stopped completely or has become intermittent.
- Listen for the ice maker motor. Clicking, repeated attempts to operate, or motor noise without normal tray movement can indicate a jam or mechanical problem.
- Check freezer temperature. Make sure the freezer is maintaining a sufficiently cold temperature for normal ice production.
- Restart the refrigerator. Disconnect power for approximately five minutes, restore power, and check whether IC returns.
Do not force the ice tray or motorized mechanism if it appears jammed.
If the IC Code Returns
If IC continues to appear, the Mini Cubed Ice Maker motor system should be diagnosed.
A technician may need to:
- inspect the ice maker mechanism for binding
- test the Mini Cubed Ice Maker motor
- verify position or Hall sensor feedback
- inspect the wiring harness and connectors
- verify power supplied to the ice maker
- check the motor drive circuit
- evaluate the Mini Cubed Ice Maker assembly
- evaluate the associated control circuit if the ice maker components test normally
Because Mini Cubed Ice Maker designs can vary between LG refrigerator models, the exact electrical tests and component specifications should be verified using service information for the specific model.
IC specifically identifies a Mini Cubed Ice Maker motor-related fault and should not be described simply as a generic “Ice Maker Error.”
Related guide: Refrigerator Ice Maker Not Working? Common Causes and What to Check →
Id — Freezer Ice Maker Tray Sensor Error
The Id error code on an LG refrigerator indicates a problem with the freezer ice maker tray temperature sensor. LG service documentation identifies E Id as a freezer ice maker tray sensor error, typically caused when the sensor circuit is shorted or disconnected.
The sensor monitors the temperature of the ice maker tray so the refrigerator can determine when conditions are appropriate for the ice-making and harvest cycle. If the control board cannot receive a valid sensor signal, normal ice maker operation may stop.
Common Causes
Possible causes include:
- failed ice maker tray temperature sensor
- open sensor circuit
- shorted sensor circuit
- loose or disconnected wiring
- damaged wire harness
- poor electrical connection
- damaged ice maker assembly
- main control board problem
The Id code does not automatically mean the complete ice maker needs replacement. The sensor, wiring, connectors, and control-board input are all part of the monitored circuit. LG service documentation specifically describes the fault as a freezer ice maker tray sensor error.
What You Can Check
- Check ice maker operation. Determine whether the freezer ice maker has stopped producing ice or is operating intermittently.
- Check freezer temperature. Make sure the freezer is maintaining normal temperatures, since ice production also depends on adequate cooling.
- Inspect for visible ice buildup. Excessive ice around the tray or mechanism can indicate an additional ice maker problem.
- Record any additional error codes. Other ice maker or sensor codes may provide useful diagnostic information.
- Restart the refrigerator. Disconnect power for approximately five minutes, restore power, and check whether the Id code returns. LG recommends a five-minute power reset as the initial consumer troubleshooting step for this family of refrigerator error codes.
If the Id Code Returns
If Id continues to appear, the freezer ice maker sensor circuit should be diagnosed.
A technician may need to:
- test the ice maker tray sensor
- compare sensor resistance with the specified value at the measured temperature
- inspect the ice maker wiring harness
- check connectors for loose or damaged terminals
- test wiring continuity
- verify the sensor signal at the main control board
- evaluate the ice maker assembly
- evaluate the main control board if the sensor and wiring test normally
Because LG uses several different ice maker designs, the exact sensor specifications and diagnostic procedure should be verified using service information for the specific refrigerator model.
Related guide: Refrigerator Ice Maker Not Working? Common Causes and What to Check →
IE — Freezer Ice Maker Error
The IE error code on an LG refrigerator indicates a problem with the freezer ice maker system. According to the LG Error Codes technical reference, IE is associated with the Cubed Ice Maker located in the freezer and indicates that the ice maker cannot operate or complete its cycle normally.
The freezer ice maker uses a motorized mechanism and position feedback to move the ice tray through its operating cycle. If the mechanism cannot reach the expected position or the control cannot detect normal operation, the IE code may appear.
Common Causes
Possible causes include:
- freezer ice maker motor failure
- ice tray or mechanism jammed by ice
- mechanical obstruction preventing tray movement
- damaged or binding ice maker mechanism
- Hall sensor or position-feedback problem
- loose electrical connector
- damaged or disconnected wiring
- freezer ice maker assembly problem
- control circuit problem
The IE code does not automatically mean that the complete ice maker assembly needs to be replaced. A mechanical obstruction, wiring problem, or loss of position feedback can prevent an otherwise functional ice maker from completing its cycle.
What You Can Check
- Check for jammed ice. Look for cubes or ice buildup that could prevent the freezer ice maker tray from moving normally.
- Check ice production. Determine whether the freezer ice maker has stopped producing ice completely or operates intermittently.
- Listen for the ice maker. Clicking, repeated motor attempts, or motor noise without normal tray movement can indicate a mechanical problem.
- Check freezer temperature. Make sure the freezer is maintaining a sufficiently cold temperature for normal ice production.
- Restart the refrigerator. Disconnect power for approximately five minutes, restore power, and check whether IE returns.
Do not force the ice tray or motorized mechanism if it appears jammed.
If the IE Code Returns
If IE continues to appear, the freezer Cubed Ice Maker system should be diagnosed.
A technician may need to:
- inspect the ice maker mechanism for binding
- test the ice maker motor
- verify Hall sensor or position feedback
- inspect gears and moving components
- check wiring and electrical connectors
- verify power and control signals
- test the freezer ice maker assembly
- evaluate the associated control circuit if the ice maker tests normally
Because LG uses different freezer ice maker designs across refrigerator models, the exact diagnostic procedure and electrical specifications should be verified using service information for the specific model.
IE specifically identifies a freezer Cubed Ice Maker fault and should not be described as an “Ice Maker Sensor Error.”
Related guide: Refrigerator Ice Maker Not Working? Common Causes and What to Check →
IF — Ice Maker Fan Error
The IF error code on an LG refrigerator indicates a problem with the ice maker fan system. On models equipped with an in-door ice maker, this fan helps circulate cold air to the ice-making compartment so it can maintain the temperature required for ice production. LG includes IF among refrigerator internal-system fault codes that require attention if they persist after a reset.
If the fan cannot operate normally, the ice maker compartment may become too warm and ice production can slow down or stop.
Common Causes
Possible causes include:
- ice or frost blocking the ice maker fan
- failed ice maker fan motor
- fan blade obstruction
- excessive frost around the fan duct
- damaged or disconnected wiring
- loose electrical connector
- fan feedback signal problem
- main control board problem
The IF code does not automatically mean that the fan motor needs to be replaced. Ice accumulation can physically prevent a working fan from turning, while wiring or control problems can prevent the expected fan signal.
What You Can Check
- Check ice production. Determine whether the ice maker has stopped producing ice or production has become unusually slow.
- Listen for unusual fan noise. Buzzing, grinding, scraping, or clicking near the ice maker compartment can indicate a fan blade contacting ice.
- Look for frost or ice buildup. Excessive frost around the ice maker compartment or air passages may restrict airflow.
- Check freezer cooling. Poor overall freezer performance can also affect ice production. LG notes that sufficiently low freezer temperatures are necessary for normal ice making.
- Restart the refrigerator. Disconnect power for approximately five minutes, restore power, and check whether IF returns. LG recommends this five-minute reset as the initial step for persistent refrigerator error codes.
Do not use knives or other sharp objects to remove ice around the fan or air ducts.
If the IF Code Returns
If IF continues to appear, the ice maker fan system should be diagnosed.
A technician may need to:
- inspect the fan for ice or mechanical obstruction
- check the air ducts for frost buildup
- test the ice maker fan motor
- verify power supplied to the fan
- check the fan feedback circuit
- inspect wiring and connectors
- determine why excessive ice is forming, if present
- evaluate the main control board if the fan circuit tests normally
If ice repeatedly builds up around the fan, simply melting the ice may only provide a temporary solution. The underlying cause of the frost accumulation should also be identified.
A persistent IF error accompanied by little or no ice production is a strong indication that the ice maker airflow system needs further diagnosis.
Related guide: Refrigerator Ice Maker Not Working? Common Causes and What to Check →
IH — Craft Ice Maker Heater Error
The IH error code on an LG refrigerator indicates a problem with the heater circuit in the Craft Ice maker systemon models equipped with this type of ice maker.
The Craft Ice maker uses a heater during parts of the ice-making and harvest process. If the refrigerator detects abnormal heater operation or an electrical problem in the heater circuit, the IH code may appear.
Common Causes
Possible causes include:
- failed Craft Ice maker heater
- open heater circuit
- damaged or disconnected wiring
- loose electrical connector
- damaged ice maker wiring harness
- ice buildup interfering with the mechanism
- Craft Ice maker assembly problem
- main control board or heater-control circuit problem
The IH code does not automatically mean that the complete Craft Ice maker needs to be replaced. The heater, wiring, connectors, and control circuit should be considered during diagnosis.
What You Can Check
- Check Craft Ice production. Determine whether the Craft Ice maker has stopped producing ice or is taking unusually long to complete a cycle.
- Look for excessive ice buildup. Inspect the accessible area around the ice maker for abnormal frost or ice accumulation.
- Check freezer temperature. Make sure the freezer is maintaining normal temperatures, since ice-making performance also depends on proper cooling.
- Listen for abnormal operation. Repeated attempts to harvest ice, clicking, or a mechanism that appears unable to complete its cycle can provide additional clues.
- Restart the refrigerator. Disconnect power for approximately five minutes, restore power, and check whether IH returns.
Do not apply external heat directly to the ice maker or force its motorized mechanism.
If the IH Code Returns
If IH continues to appear, the Craft Ice maker heater circuit should be diagnosed.
A technician may need to:
- test the ice maker heater
- measure heater resistance
- inspect the ice maker wiring harness
- check connectors for loose or damaged terminals
- verify power supplied to the heater
- inspect the ice maker mechanism
- test the heater-control circuit
- evaluate the Craft Ice maker assembly
- evaluate the main control board if the heater and wiring test normally
Because LG uses different ice maker configurations across refrigerator models, the exact heater resistance, wiring, and diagnostic procedure should be verified using service information for the specific model.
Related guide: Refrigerator Ice Maker Not Working? Common Causes and What to Check →
IO — Mini Cubed Ice Maker Temperature Sensor Error
The IO error code on an LG refrigerator indicates a problem with the Mini Cubed Ice Maker temperature sensor circuit. The code appears when the Main PCB is not receiving a valid signal from the Mini Cubed Ice Maker sensor.
This sensor provides temperature information that the refrigerator uses to control Mini Cubed Ice Maker operation. If the sensor circuit becomes open, shorted, or otherwise cannot provide the expected signal, the IO code may appear.
Common Causes
Possible causes include:
- failed Mini Cubed Ice Maker temperature sensor
- open sensor circuit
- shorted sensor circuit
- loose sensor connection
- damaged or disconnected wiring
- poor connection at the Main PCB
- damaged ice maker wiring harness
- Main PCB problem
The IO code does not automatically mean that the entire ice maker has failed. The sensor, wiring, connections, and Main PCB input should be checked as part of the diagnosis.
What You Can Check
- Check Mini Cubed Ice production. Determine whether the ice maker has stopped producing ice or operates intermittently.
- Check freezer temperature. Make sure the freezer is maintaining a sufficiently cold temperature for normal ice production.
- Look for additional error codes. Other ice maker or sensor codes may provide useful diagnostic information.
- Restart the refrigerator. Disconnect power for approximately five minutes, restore power, and check whether IO returns.
Further testing requires electrical measurements at the sensor and control board.
If the IO Code Returns
If IO continues to appear, the Mini Cubed Ice Maker temperature sensor circuit should be diagnosed.
A technician may need to:
- inspect the sensor connection
- inspect wiring at the Main PCB
- measure sensor resistance
- measure sensor circuit voltage
- check wiring for open or short conditions
- verify continuity between the sensor and Main PCB
- evaluate the Mini Cubed Ice Maker sensor
- evaluate the Main PCB if it is not supplying the correct sensor voltage
The technical reference states that the error is detected when the Main PCB sees 0 or 5 VDC on the sensor circuit. In its example for model LRYKC2606, an open or shorted sensor requires replacement of the ice maker, while a PCB that does not supply voltage to the sensor points toward the PCB.
Because these measurements and connector locations are model-specific, diagnosis should use service information for the exact refrigerator model.
IO specifically identifies the Mini Cubed Ice Maker temperature sensor circuit and should not be described simply as a generic “Ice Maker Error.”
Related guide: Refrigerator Ice Maker Not Working? Common Causes and What to Check →
IS — Ice Maker Sensor Error
The IS error code on an LG refrigerator indicates a problem with the ice maker temperature sensor. LG identifies IS as a fault in the sensor that monitors ice maker temperature. If the sensor cannot provide the expected temperature information, ice maker operation may stop or become unreliable.
Common Causes
Possible causes include:
- failed ice maker temperature sensor
- open or shorted sensor circuit
- loose or disconnected electrical connector
- damaged ice maker wiring harness
- broken or damaged wiring
- poor connection at the control board
- ice maker assembly problem
- main control board problem
The IS code does not automatically mean the complete ice maker needs to be replaced. The temperature sensor, wiring, connectors, and control-board input are all part of the circuit that should be considered during diagnosis.
What You Can Check
- Check ice production. Determine whether the ice maker has stopped producing or dispensing ice.
- Check freezer temperature. Make sure the freezer is maintaining a sufficiently cold temperature for normal ice production.
- Look for abnormal ice or frost buildup. Excessive frost around the ice maker may indicate an additional problem.
- Record any additional codes. Other ice maker, fan, or sensor errors can provide useful diagnostic information.
- Restart the refrigerator. Unplug the refrigerator for approximately five minutes, restore power, and check whether IS returns. LG recommends this reset as the initial consumer troubleshooting step for IS and other internal-system error codes.
If the IS Code Returns
If IS continues to appear, the ice maker temperature sensor circuit should be professionally diagnosed. LG recommends service when the code remains after the power reset.
A technician may need to:
- test the ice maker temperature sensor
- measure sensor resistance
- compare the reading with the model-specific temperature/resistance specification
- inspect the ice maker wiring harness
- check connectors for loose or damaged terminals
- test wiring continuity
- verify the sensor input at the main control board
- evaluate the control board if the sensor and wiring test normally
LG specifically notes that an IS fault can cause the ice maker to stop operating normally. Because ice maker configurations vary between models, the exact sensor specifications should be verified using service information for the specific refrigerator model.
Related guide: Refrigerator Ice Maker Not Working? Common Causes and What to Check →
It — In-Door Ice Maker Kit Error
The It error code on an LG refrigerator indicates a problem with the in-door ice maker kit. On models equipped with an ice maker located in the refrigerator door, the control has detected that the ice maker mechanism is not operating as expected.
The in-door ice maker uses a motorized mechanism and position feedback to move the ice tray through its operating cycle. If the tray cannot reach the required position or the control does not receive the expected feedback, the It code may appear.
Common Causes
Possible causes include:
- in-door ice maker motor failure
- ice tray or mechanism jammed by ice
- mechanical obstruction preventing tray movement
- Hall sensor or position-feedback problem
- damaged or binding ice maker mechanism
- loose electrical connector
- damaged or disconnected wiring
- in-door ice maker kit failure
- control circuit problem
The It code does not automatically mean that the complete ice maker kit needs to be replaced. A mechanical obstruction, wiring problem, or loss of position feedback can prevent the mechanism from completing its normal cycle.
What You Can Check
- Check for jammed ice. Look for cubes or frost that may prevent the in-door ice maker tray from moving normally.
- Check ice production. Determine whether the in-door ice maker has stopped producing ice or operates intermittently.
- Listen for the ice maker. Clicking, repeated motor attempts, or motor noise without normal tray movement may indicate a jam or mechanical problem.
- Check the ice compartment. Make sure there is no excessive frost or ice buildup interfering with the mechanism.
- Restart the refrigerator. Disconnect power for approximately five minutes, restore power, and check whether It returns.
Do not force the ice tray or motorized mechanism if it appears jammed.
If the It Code Returns
If It continues to appear, the in-door ice maker kit should be diagnosed.
A technician may need to:
- inspect the ice maker mechanism for binding
- test the ice maker motor
- verify Hall sensor or position feedback
- inspect the tray and moving components
- check wiring and electrical connectors
- verify power and control signals
- test the in-door ice maker kit
- evaluate the associated control circuit if the ice maker tests normally
Because LG uses different in-door ice maker designs across refrigerator models, the exact test procedure and component specifications should be verified using service information for the specific model.
It specifically identifies an In-Door Ice Maker Kit fault and should not be described simply as a generic “Ice Maker Error.”
Related guide: Refrigerator Ice Maker Not Working? Common Causes and What to Check →
IU — Freezer Ice Maker Unit Error
The IU error code on an LG refrigerator indicates a problem with the freezer ice maker assembly. LG service documentation identifies E IU as a freezer ice maker kit defect. On applicable models, the code can appear when the ice maker cannot complete its expected movement or the control does not receive the correct tray-position signal.
The freezer ice maker uses a motorized mechanism and position feedback to move through its harvest, water-fill, and freezing cycles. If the mechanism cannot reach the expected position, normal ice production may stop.
Common Causes
Possible causes include:
- ice maker mechanism jammed by ice
- ice maker motor failure
- tray unable to reach the correct position
- Hall sensor or position-feedback problem
- damaged gears or mechanical components
- loose or disconnected wiring
- damaged ice maker wiring harness
- freezer ice maker assembly failure
- main control board problem
The IU code does not automatically mean the entire ice maker must be replaced. A mechanical obstruction, wiring problem, or loss of position feedback can prevent a functional ice maker from completing its cycle.
What You Can Check
- Check ice production. Determine whether the freezer ice maker has completely stopped producing ice or works intermittently.
- Look for jammed ice. Check the accessible ice maker area for cubes or ice buildup that could prevent normal tray movement.
- Check freezer temperature. Make sure the freezer is maintaining a sufficiently cold temperature for normal ice production.
- Listen for the ice maker. Clicking, repeated motor operation, or movement that stops before completing a cycle may indicate a mechanical problem.
- Restart the refrigerator. Disconnect power for approximately five minutes, restore power, and check whether IU returns. LG recommends a five-minute power reset as the initial step when IU and similar internal-system codes appear.
Do not force the ice tray or motorized mechanism if it appears jammed.
If the IU Code Returns
If IU continues to appear, the freezer ice maker system should be diagnosed.
A technician may need to:
- inspect the ice maker for mechanical binding
- test the ice maker motor
- verify tray-position or Hall-sensor feedback
- inspect gears and moving components
- check wiring and electrical connectors
- verify power and control signals
- test the freezer ice maker assembly
- evaluate the main control board if the ice maker and wiring test normally
LG service documentation shows that an IU fault can occur when the ice maker receives no tray-position signal and cannot proceed to the water-fill and freezing stages.
Because LG uses different freezer ice maker designs, the exact test procedure should be verified using service information for the specific refrigerator model.
Related guide: Refrigerator Ice Maker Not Working? Common Causes and What to Check →
Rotary Knob — Control Knob Error
The Rotary Knob error on certain LG refrigerators indicates a problem with the rotary control knob or its input circuit. On models equipped with this type of control, the knob sends user selections to the refrigerator’s electronic control system.
If the control cannot correctly detect the knob position or receives an abnormal input signal, the Rotary Knob error may appear.
Common Causes
Possible causes include:
- rotary knob stuck or unable to move normally
- damaged rotary knob mechanism
- rotary encoder or switch failure
- loose electrical connector
- damaged or disconnected wiring
- moisture or contamination around the control
- user-interface board problem
- electronic control problem
The error does not automatically mean that the entire user-interface assembly needs replacement. The physical knob, encoder, wiring, connectors, and electronic input circuit may all need to be considered.
What You Can Check
- Check knob movement. Make sure the rotary knob turns normally and is not physically stuck or binding.
- Check control response. Turn the knob through its available positions and note whether the display or selected function responds correctly.
- Check for physical damage. Look for a loose, cracked, displaced, or damaged knob.
- Check for moisture. If the control area has recently been exposed to moisture, allow it to dry completely before evaluating operation again.
- Restart the refrigerator. Disconnect power for approximately five minutes, restore power, and check whether the error returns.
Do not force a rotary knob that is jammed or difficult to turn.
If the Rotary Knob Error Returns
If the Rotary Knob error continues to appear, the control input circuit should be diagnosed using service information for the specific LG refrigerator model.
A technician may need to:
- inspect the rotary knob mechanism
- test the rotary encoder or switch
- inspect wiring and connectors
- verify the input signal
- check the user-interface board
- evaluate communication with the main control board
- replace the affected control assembly if testing confirms a failure
Because a rotary control is used only on certain LG refrigerator models, the exact component design and diagnostic procedure are model-specific.
LAS — Left Auto Drawer Reed Switch Error
The LAS error code on an LG refrigerator indicates a problem with the left Auto Drawer reed switch on models equipped with the automatic drawer system.
According to the technical reference, LAS is triggered when the left Auto Drawer reed switch is closed when it should be open.
The reed switch allows the refrigerator’s control system to detect the position of the Auto Drawer. If the switch remains in the wrong state, the control cannot correctly determine the position of the left drawer.
Common Causes
Possible causes include:
- failed left Auto Drawer reed switch
- reed switch stuck in the closed state
- reed switch or magnet misalignment
- loose or disconnected switch connector
- damaged wiring
- drawer not reaching the correct position
- mechanical obstruction affecting drawer movement
- damaged Auto Drawer mechanism
The LAS code specifically points to the left reed switch and its operation, rather than the Auto Drawer motor itself. The technical reference recommends checking the left reed switch for both proper connection and operation.
What You Can Check
- Check the left Auto Drawer. Make sure it opens and closes normally.
- Check for obstructions. Remove anything that could prevent the drawer from reaching its normal position.
- Check drawer alignment. A misaligned drawer can prevent the reed switch and its magnet from reaching the correct relationship.
- Do not force the drawer. If the motorized mechanism is binding or jammed, forcing it may cause additional damage.
- Restart the refrigerator. Disconnect power for approximately five minutes, restore power, and check whether LAS returns.
If the LAS Code Returns
If LAS continues to appear, the left Auto Drawer position-sensing system should be diagnosed.
A technician may need to:
- inspect the left reed switch
- verify switch and magnet alignment
- check whether the switch opens and closes correctly
- inspect the reed switch connector
- test wiring continuity
- inspect the drawer mechanism and positioning
- verify the switch signal at the control system
The key diagnostic condition is that the left reed switch remains closed when the control expects it to be open.
Od — Wi-Fi Modem / Communication Error
The Od error code on an LG refrigerator indicates an internal system fault on certain models. LG includes Er Odamong refrigerator error codes that can be caused by an internal component, control circuit, or disconnected wiring. LG recommends resetting the refrigerator first and arranging service if the code returns.
Because the exact circuit associated with Od can vary by model, diagnosis should be based on the specific refrigerator model and its service documentation rather than replacing a component based on the code alone.
Common Causes
Possible causes include:
- internal communication problem
- loose or disconnected wiring
- damaged wire harness
- poor electrical connection
- electronic module problem
- control circuit fault
- main control board problem
- temporary electrical or communication fault
The Od code does not by itself confirm that a particular electronic module has failed.
What You Can Check
- Check normal refrigerator operation. Note whether cooling, the display, dispenser, ice maker, and other functions continue to operate normally.
- Check for additional error codes. Another code displayed together with Od may help identify the affected system.
- Check for recent power problems. A power interruption or unstable electrical condition can sometimes contribute to electronic faults.
- Restart the refrigerator. Unplug it from the wall outlet, wait approximately 5 minutes, reconnect power, and check whether Od returns. This is LG’s recommended first troubleshooting step for Er Od and related internal-system codes.
Avoid disassembling electronic modules or testing energized circuits unless you are qualified to perform electrical diagnostics.
If the Od Code Returns
If Od continues to appear after the reset, the refrigerator should be diagnosed using technical information for the exact model.
A technician may need to:
- inspect wiring harnesses and connectors
- verify power and ground connections
- check communication circuits
- test the affected electronic module
- inspect the main control board
- perform model-specific diagnostic tests
LG recommends professional service when Er Od persists after the five-minute power reset.
Because LG uses different electronic architectures across refrigerator models, the model number is particularly important when diagnosing an Od error.
OFF — Cooling Off / Demo Mode
The OFF display on an LG refrigerator usually does not indicate a malfunction. It means the refrigerator is in Cooling Off Mode, sometimes called Demo Mode or Display Mode. In this mode, the interior lights and control panel may continue to operate, but the refrigerator’s cooling system is disabled.
This mode is commonly used for refrigerators displayed in retail stores so customers can use the controls without running the compressor and cooling system.
What Happens in OFF Mode
When Cooling Off Mode is active:
- the refrigerator does not cool normally
- the freezer does not maintain freezing temperature
- the display and interior lights may still operate
- the refrigerator may appear to have power even though cooling is disabled
- the display may show OFF or another model-specific indication
If a refrigerator has power but both compartments are warm and OFF appears on the display, check Cooling Off/Demo Mode before assuming there is a cooling-system failure.
Why OFF Mode May Be Active
Possible reasons include:
- the refrigerator was intentionally placed in Demo Mode
- the mode was activated accidentally through the control panel
- the refrigerator was recently installed or serviced
- a control-panel button combination was unintentionally pressed
Unlike most codes on this page, OFF is a refrigerator operating mode rather than a component fault.
What You Can Check
- Confirm that OFF is displayed. Make sure the refrigerator has power and the control panel responds normally.
- Check both compartments. If the refrigerator and freezer are not cooling while lights and controls still work, Cooling Off Mode may be active.
- Exit Cooling Off Mode. The required button combination varies by LG refrigerator model. LG advises checking the model-specific procedure rather than using one universal sequence.
- Allow time for temperatures to recover. After cooling is restored, the refrigerator will need time to return to its normal operating temperature.
If OFF Cannot Be Cleared
If the refrigerator cannot be taken out of Cooling Off Mode, or OFF returns unexpectedly, further diagnosis may be necessary.
A technician may need to:
- verify control-panel operation
- check the user-interface controls
- inspect wiring and connectors
- verify communication with the main control board
- perform model-specific diagnostic tests
If OFF disappears but the refrigerator still does not begin cooling, the appliance may have a separate cooling problem unrelated to Demo Mode.
Related guide: Refrigerator Not Cooling? Common Causes and What to Check →
PS — Pantry Sensor Error
The PS error code on an LG refrigerator indicates a problem with the pantry temperature sensor circuit on models equipped with a temperature-controlled pantry or drawer.
The pantry sensor monitors the temperature inside the drawer and sends this information to the main control board. The refrigerator uses that signal to regulate the temperature of the pantry compartment. If the sensor circuit is open, shorted, or produces an abnormal signal, the PS code may appear.
Common Causes
Possible causes include:
- failed pantry temperature sensor
- open sensor circuit
- shorted sensor circuit
- damaged or disconnected wiring
- loose electrical connector
- damaged wiring near the pantry drawer
- moisture or corrosion at a connector
- main control board problem
The PS code does not automatically mean that the pantry sensor itself needs replacement. The sensor, wiring, connectors, and control-board input are all part of the circuit and should be considered during diagnosis.
What You Can Check
- Check pantry temperature. Determine whether items in the pantry drawer seem warmer or colder than the selected setting.
- Check drawer operation. Make sure the pantry drawer closes completely and nothing interferes with its normal position.
- Check the temperature setting. If your model allows different pantry temperature modes, verify that the selected setting is appropriate.
- Look for other symptoms. Unstable drawer temperatures or additional sensor codes may provide useful diagnostic information.
- Restart the refrigerator. Disconnect power for approximately five minutes, restore power, and check whether PS returns.
Accessing and electrically testing the pantry sensor generally requires disassembly and resistance measurements.
If the PS Code Returns
If PS continues to appear, the pantry sensor circuit should be diagnosed.
A technician may need to:
- measure pantry sensor resistance
- compare the reading with the expected temperature/resistance specification
- inspect the sensor and connector
- check wiring for open or short circuits
- test wiring continuity
- inspect connectors for moisture or corrosion
- verify the sensor signal at the main control board
- evaluate the control board if the sensor and wiring test normally
Because LG refrigerator configurations vary, the exact location and resistance specifications of the pantry sensor should be verified using service information for the specific model.
A persistent PS error may prevent the refrigerator from accurately controlling the temperature of the pantry compartment even when the main refrigerator and freezer sections continue cooling normally.
rAS — Right Auto Drawer Reed Switch Error
The rAS error code on an LG refrigerator indicates a problem with the right Auto Drawer reed switch system on models equipped with the automatic drawer feature.
According to the technical reference, rAS is triggered when the right Auto Drawer reed switch is closed when it should be in the open state.
The reed switch provides position information to the refrigerator’s control system. If the switch remains closed when the control expects it to be open, the refrigerator cannot correctly determine the position of the right Auto Drawer.
Common Causes
Possible causes include:
- failed right Auto Drawer reed switch
- reed switch stuck in the closed state
- reed switch or magnet misalignment
- loose or disconnected switch connector
- damaged wiring
- drawer not reaching the correct position
- mechanical obstruction affecting drawer movement
- damaged Auto Drawer mechanism
The rAS code specifically points to the right reed switch and its circuit, rather than directly indicating a failure of the Auto Drawer motor. The technical reference recommends checking the right reed switch for proper connection and operation.
What You Can Check
- Check the right Auto Drawer. Make sure the drawer opens and closes normally.
- Check for obstructions. Remove food containers or other items that could prevent the drawer from reaching its normal position.
- Check drawer alignment. A misaligned drawer or mechanism may prevent the reed switch and magnet from reaching the correct relationship.
- Do not force the drawer. If the motorized mechanism appears jammed, forcing it may cause additional damage.
- Restart the refrigerator. Disconnect power for approximately five minutes, restore power, and check whether rAS returns.
If the rAS Code Returns
If rAS continues to appear, the right Auto Drawer position-sensing system should be diagnosed.
A technician may need to:
- inspect the right reed switch
- verify switch and magnet alignment
- check whether the switch opens and closes correctly
- inspect the reed switch connector
- test wiring continuity
- inspect the drawer mechanism and positioning
- verify the switch signal at the control system
The key diagnostic condition is that the right reed switch remains closed when the control expects it to be open.
rF — Refrigerator Fan Error
The rF error code on an LG refrigerator indicates that the refrigerator compartment fan motor is not operating normally. LG distinguishes rF from FF: rF refers to the refrigerator compartment fan, while FF refers to the freezer fan.
The refrigerator fan circulates cold air through the fresh-food compartment. If the fan stops operating, airflow can decrease and refrigerator temperatures may begin to rise even if other parts of the cooling system continue to operate.
Common Causes
Possible causes include:
- refrigerator fan motor failure
- fan blade blocked by frost or ice
- excessive frost around the fan or evaporator
- mechanical obstruction preventing the fan from turning
- damaged or disconnected wiring
- loose electrical connector
- fan feedback signal problem
- main control board problem
The rF code does not automatically mean that the fan motor needs replacement. A fan that is mechanically locked by ice can produce the same error as a failed motor. LG specifically identifies abnormal refrigerator fan operation as the condition behind Er rF.
What You Can Check
- Check refrigerator temperature. Determine whether the fresh-food compartment is becoming warmer than normal.
- Check airflow. Look for reduced or absent airflow from the refrigerator’s interior vents.
- Listen for unusual fan noise. Buzzing, grinding, scraping, or clicking can indicate that the fan is obstructed or contacting frost or ice.
- Look for frost buildup. Visible frost or ice around the refrigerator’s interior air passages may indicate an airflow or defrost-related problem.
- Restart the refrigerator. Disconnect power for approximately five minutes, restore power, and check whether rF returns. LG recommends a five-minute power reset as the first troubleshooting step.
Keep in mind that fan operation can change when refrigerator doors are opened, so not hearing the fan with the door open does not necessarily confirm a failed motor.
If the rF Code Returns
If rF continues to appear, the refrigerator fan system should be diagnosed.
A technician may need to:
- inspect the fan for ice or mechanical obstruction
- check the fan motor for free movement
- test the refrigerator fan motor
- verify voltage supplied to the fan
- check the fan feedback signal
- inspect wiring and connectors
- investigate excessive frost or ice buildup
- evaluate the main control board if the fan circuit tests normally
LG recommends professional inspection when the rF code returns after the refrigerator has been reset.
If ice repeatedly prevents the fan from operating, simply thawing the refrigerator may only temporarily remove the symptom. The reason for the recurring ice buildup should also be identified.
Related guide: Refrigerator Not Cooling? Common Causes and What to Check →
rS — Refrigerator Sensor Error
The rS error code on an LG refrigerator indicates a problem with the refrigerator compartment temperature sensor (thermistor) circuit. The control board has detected an abnormal sensor signal, typically because the circuit is open or shorted.
The refrigerator sensor monitors the temperature inside the fresh-food compartment and sends this information to the main control board. The control uses this signal to regulate cooling and maintain the selected refrigerator temperature.
Common Causes
Possible causes include:
- failed refrigerator temperature sensor
- open sensor circuit
- shorted sensor circuit
- damaged or disconnected wiring
- loose electrical connector
- damaged sensor wiring harness
- moisture or corrosion at a connector
- poor connection at the main control board
- main control board problem
The rS code does not automatically mean that the temperature sensor itself needs replacement. The thermistor, wiring, connectors, and control-board input are all part of the monitored circuit.
What You Can Check
- Check refrigerator temperature. Determine whether the fresh-food compartment is warmer or colder than the selected setting.
- Check for unstable temperatures. Food freezing in the refrigerator compartment or temperatures fluctuating significantly can provide additional clues.
- Check the temperature setting. Make sure the refrigerator has not simply been set unusually warm or cold.
- Record any additional codes. Multiple sensor-related errors may indicate a broader wiring, connection, or control problem.
- Restart the refrigerator. Disconnect power for approximately five minutes, restore power, and check whether rS returns.
A reset may clear a temporary electronic condition, but it will not correct an open or shorted sensor circuit.
If the rS Code Returns
If rS continues to appear, the refrigerator temperature sensor circuit should be diagnosed.
A technician may need to:
- measure refrigerator thermistor resistance
- compare the reading with the expected value at the measured temperature
- inspect the sensor and connector
- check wiring for open or short circuits
- test wiring continuity between the sensor and control board
- inspect connectors for moisture or corrosion
- verify the sensor signal at the main control board
- evaluate the control board if the sensor and wiring test normally
Because thermistor resistance changes with temperature, the measured value should be compared with the correct temperature/resistance specification for the specific LG refrigerator model.
A persistent rS error can prevent the refrigerator from accurately regulating fresh-food compartment temperature and may result in poor cooling, excessive cooling, or unstable temperatures.
Related guide: Refrigerator Not Cooling? Common Causes and What to Check →
rS2 — Refrigerator Sensor 2 Error
The rS2 error code on an LG refrigerator indicates a problem with the secondary refrigerator compartment temperature sensor (Refrigerator Sensor 2) on models equipped with more than one temperature-sensing circuit in the fresh-food section.
The secondary thermistor provides temperature information to the main control board. If the control detects an abnormal signal—such as an open or shorted sensor circuit—the rS2 code may appear.
Common Causes
Possible causes include:
- failed Refrigerator Sensor 2 thermistor
- open sensor circuit
- shorted sensor circuit
- damaged or disconnected wiring
- loose electrical connector
- damaged sensor wiring harness
- moisture or corrosion at a connection
- poor connection at the main control board
- main control board problem
The rS2 code does not automatically mean that the sensor itself needs replacement. The thermistor, wiring, connectors, and control-board input should be tested as one circuit.
What You Can Check
- Check refrigerator temperature. Determine whether the fresh-food compartment is maintaining the selected temperature.
- Look for uneven temperatures. Some areas of the refrigerator may become warmer or colder than expected when one of multiple temperature sensors is not providing accurate information.
- Check for unusual cooling behavior. Excessive cooling, insufficient cooling, or unusually long compressor operation can provide additional diagnostic clues.
- Record other error codes. An
rScode appearing together withrS2, for example, may indicate a broader sensor, wiring, or control issue. - Restart the refrigerator. Disconnect power for approximately five minutes, restore power, and check whether rS2 returns.
Testing the thermistor itself normally requires resistance measurements and the model-specific temperature/resistance chart.
If the rS2 Code Returns
If rS2 continues to appear, the Refrigerator Sensor 2 circuit should be diagnosed.
A technician may need to:
- measure Sensor 2 thermistor resistance
- compare resistance with the expected value at the measured temperature
- inspect the sensor connector
- check wiring for open or short circuits
- test wiring continuity
- inspect connectors for moisture or corrosion
- verify the sensor signal at the main control board
- evaluate the main control board if the sensor and wiring test normally
Because Refrigerator Sensor 2 is used only on certain LG refrigerator configurations, its location, specifications, and diagnostic procedure are model-specific.
rS generally identifies the primary refrigerator temperature sensor circuit, while rS2 identifies the secondary refrigerator temperature sensor circuit on models that use one.
rt — Room Temperature Sensor Error
The rt error code on an LG refrigerator indicates a problem with the room temperature sensor (ambient temperature sensor) circuit. On models equipped with this sensor, it monitors the temperature around the refrigerator and provides that information to the electronic control system.
If the control board detects an abnormal signal from the room temperature sensor—such as an open or shorted circuit—the rt code may appear.
Common Causes
Possible causes include:
- failed room temperature sensor
- open sensor circuit
- shorted sensor circuit
- damaged or disconnected wiring
- loose electrical connector
- damaged sensor wiring harness
- moisture or corrosion at a connection
- poor connection at the main control board
- main control board problem
The rt code does not automatically mean the ambient temperature sensor needs replacement. The sensor, wiring, connectors, and control-board input should be considered as a complete circuit.
What You Can Check
- Check the refrigerator environment. Make sure the appliance is not exposed to unusually high or low ambient temperatures.
- Check for nearby heat sources. Ovens, direct sunlight, heaters, or other heat-producing equipment can affect the conditions around the refrigerator.
- Check refrigerator operation. Note whether cooling performance or compressor operation has changed since the code appeared.
- Record other error codes. Additional temperature-sensor codes can help identify a broader wiring or electronic-control problem.
- Restart the refrigerator. Disconnect power for approximately five minutes, restore power, and check whether rt returns.
A power reset can clear a temporary electronic condition, but it will not correct a failed sensor or damaged sensor circuit.
If the rt Code Returns
If rt continues to appear, the room temperature sensor circuit should be diagnosed.
A technician may need to:
- measure ambient sensor resistance
- compare the reading with the expected value at the measured temperature
- inspect the sensor and connector
- check the circuit for open or short conditions
- test wiring continuity
- inspect connectors for damage or corrosion
- verify the sensor input at the main control board
- evaluate the control board if the sensor and wiring test normally
Because thermistor resistance changes with temperature, measurements should be compared with the correct temperature/resistance specifications for the specific LG refrigerator model.
A persistent rt error primarily indicates an ambient temperature sensing or circuit problem. It does not by itself indicate a sealed-system or compressor failure.
Sb — Sabbath Mode
The Sb code on an LG refrigerator indicates that Sabbath Mode is active. This is an operating mode rather than a refrigerator malfunction or component failure.
On compatible LG refrigerators, Sabbath Mode modifies certain automatic functions so the appliance can be used in accordance with Sabbath observance. Depending on the model, the display, interior lights, alarms, dispenser, ice maker, or other features may operate differently while the mode is enabled.
What Happens in Sabbath Mode
Depending on the LG refrigerator model, Sabbath Mode may:
- display
Sbon the control panel - disable or change interior light operation
- disable certain door alarms or sounds
- restrict control-panel functions
- disable the dispenser or ice maker
- prevent some functions from responding normally
The refrigerator’s cooling system can continue operating while Sabbath Mode is active.
Why Sb May Appear
The Sb display may appear because:
- Sabbath Mode was intentionally activated
- the mode was enabled accidentally through the control panel
- a button combination was pressed unintentionally
- the refrigerator’s settings were changed by another user
Because Sb represents a mode, replacing parts or troubleshooting the refrigeration system is normally unnecessary just because Sb is displayed.
What You Can Check
- Confirm that the display shows Sb. Make sure it is not another similar-looking code.
- Check refrigerator temperature. If both compartments are maintaining normal temperatures, the cooling system is likely operating normally.
- Check other functions. Lights, alarms, the dispenser, or ice maker may behave differently while Sabbath Mode is enabled.
- Exit Sabbath Mode. The exact control-panel procedure can vary by LG refrigerator model, so use the instructions for your specific model.
If Sb Cannot Be Cleared
If Sb remains displayed after Sabbath Mode has been correctly disabled, restart the refrigerator and check the controls again.
If the mode still cannot be cleared, further diagnosis may be needed. A technician may need to:
- check control-panel operation
- inspect the user-interface controls
- verify button or touch-control inputs
- inspect wiring and connectors
- check communication with the main control board
If the refrigerator is not cooling properly, that should be diagnosed separately because Sb itself normally indicates Sabbath Mode rather than a cooling-system fault.
Note: Sb is a status/mode indicator, not an error code.
SC — Showcase Door Communication Error
The SC error code on an LG refrigerator indicates a communication problem involving the Showcase Door systemon models equipped with this feature. The refrigerator’s control system is not receiving the expected communication signal from the electronic components associated with the door.
Because the Showcase Door system is only used on certain LG refrigerator models, the exact modules and communication circuit involved can vary by model.
Common Causes
Possible causes include:
- loose or disconnected door wiring
- damaged wiring harness
- poor connection at a door hinge
- loose electrical connector
- Showcase Door electronic module problem
- user-interface or display communication problem
- main control board communication fault
- temporary electrical or communication issue
Door-related communication errors are particularly important to inspect around the hinge and wiring-harness connections, where wiring moves whenever the door is opened and closed.
What You Can Check
- Check Showcase Door operation. Determine whether the door and its related functions operate normally.
- Check the display and controls. Note whether any controls associated with the door are unresponsive or operate intermittently.
- Watch for intermittent behavior. If the problem changes when the refrigerator door is opened or closed, a wiring or connector issue may be involved.
- Record additional error codes. Other communication codes may help identify the affected electronic circuit.
- Restart the refrigerator. Disconnect power for approximately five minutes, restore power, and check whether SC returns.
Avoid removing door panels or testing energized wiring unless you are qualified to perform electrical diagnostics.
If the SC Code Returns
If SC continues to appear, the Showcase Door communication circuit should be diagnosed.
A technician may need to:
- inspect wiring through the door and hinge area
- inspect electrical connectors
- test wiring continuity
- verify power and ground to the affected module
- test communication lines
- evaluate the Showcase Door electronics
- check communication with the main control board
- evaluate the main control board if the wiring and door electronics test normally
Because LG uses different Showcase/Door-in-Door configurations, the exact diagnostic procedure should be based on the specific refrigerator model and service documentation.
An SC error primarily indicates an electronic communication problem and does not by itself mean that the refrigerator’s sealed cooling system has failed.
Sd — Pantry Drawer Sensor Error
The Sd error code on an LG refrigerator indicates a problem with the pantry drawer temperature sensor circuit on models equipped with a temperature-controlled drawer.
The sensor monitors the temperature in the pantry or convertible drawer and sends this information to the refrigerator’s control board. If the control detects an abnormal sensor signal, such as an open or shorted circuit, the Sd code may appear.
Common Causes
Possible causes include:
- failed pantry drawer temperature sensor
- open sensor circuit
- shorted sensor circuit
- damaged or disconnected wiring
- loose electrical connector
- damaged wiring near the drawer
- moisture or corrosion at a connection
- main control board problem
The Sd code does not automatically mean the sensor itself needs replacement. The thermistor, wiring, connectors, and control-board input should be checked as part of the same circuit.
What You Can Check
- Check drawer temperature. Determine whether the pantry or convertible drawer is warmer or colder than its selected setting.
- Check drawer operation. Make sure the drawer closes completely and nothing interferes with its normal position.
- Check the selected temperature mode. If your model provides different settings for meat, deli, produce, or other storage modes, verify the current selection.
- Look for other symptoms. Unstable drawer temperatures or additional sensor codes may help identify a broader electrical problem.
- Restart the refrigerator. Disconnect power for approximately five minutes, restore power, and check whether Sd returns.
A power reset may clear a temporary electronic condition, but it will not correct a failed sensor or damaged sensor circuit.
If the Sd Code Returns
If Sd continues to appear, the pantry drawer sensor circuit should be diagnosed.
A technician may need to:
- measure the drawer temperature sensor resistance
- compare the reading with the expected value at the measured temperature
- inspect the sensor connector
- check wiring for open or short circuits
- test wiring continuity
- inspect connectors for moisture or corrosion
- verify the sensor signal at the control board
- evaluate the main control board if the sensor and wiring test normally
Because pantry and convertible-drawer configurations vary between LG refrigerator models, the exact sensor location and resistance specifications should be verified using service information for the specific model.
A persistent Sd error may affect temperature regulation in the drawer while the refrigerator and freezer compartments continue to operate normally.
SF — Refrigerator Temperature Compensation Mode
The SF display is not an error code. It indicates that the LG refrigerator has entered Refrigerator Temperature Compensation Mode, a service adjustment mode used to calibrate the refrigerator compartment temperature.
This mode allows the temperature offset to be adjusted when the actual refrigerator temperature differs slightly from the selected temperature even though the refrigerator temperature sensor is operating within its normal specifications.
What SF Means
For example, the refrigerator may be set to 33°F, but the measured compartment temperature remains slightly warmer than expected.
If the temperature sensor has already been tested and its readings are within specification, a technician can use Temperature Compensation Mode to adjust the control’s temperature offset rather than replacing a properly functioning sensor.
This means SF is fundamentally different from codes such as FS, rS, or dS, which indicate sensor-related faults.
Why SF May Appear
SF may be displayed because:
- Refrigerator Temperature Compensation Mode was intentionally entered
- a technician is calibrating refrigerator temperature
- the service adjustment mode was activated accidentally
- the refrigerator’s temperature offset is being checked or adjusted
Its presence alone does not indicate a component failure.
What You Can Check
- Check the actual refrigerator temperature. If possible, measure the compartment temperature rather than relying only on the displayed setting.
- Check the selected temperature. Compare the refrigerator’s actual temperature with the temperature selected on the control panel.
- Do not change the compensation value unnecessarily. This adjustment affects how the refrigerator regulates temperature.
- Use model-specific instructions. The procedure for entering, adjusting, and exiting service modes can vary between LG refrigerator models.
If SF Appears Unexpectedly
If SF appears during normal use and you did not intentionally enter a service mode, avoid changing calibration values without knowing their original settings.
A technician can:
- verify the actual compartment temperature
- test the refrigerator temperature sensor
- compare thermistor readings with specifications
- determine whether temperature compensation is necessary
- correctly adjust the temperature offset
- return the refrigerator to normal operation
Temperature compensation should generally be considered after confirming that the thermistor is operating correctly, rather than using it to compensate for an actual sensor or cooling-system failure. That’s also how the source describes the intended use of the mode.
Note: SF is a service/temperature compensation mode, not an error code.
Sr — Refrigerator Temperature Compensation Mode
The Sr display is not an error code. It indicates Refrigerator Temperature Compensation Mode, a service adjustment used on certain LG refrigerators to fine-tune the temperature of the fresh-food compartment.
This mode allows a technician to apply a temperature offset when the refrigerator compartment is consistently slightly warmer or colder than expected, even though the temperature sensor itself is operating correctly.
What Sr Means
The refrigerator uses a thermistor to monitor fresh-food compartment temperature. If the thermistor tests within specification but the actual compartment temperature differs from the desired temperature, Sr compensation can be used to adjust how the control regulates cooling.
For example, compensation may be appropriate when:
- the displayed setting is correct
- the refrigerator sensor tests normally
- actual compartment temperature is consistently higher or lower than expected
- no other cooling-system fault is present
Sr therefore should not be confused with rS — Refrigerator Sensor Error. rS indicates a sensor-circuit problem, while Sr is a temperature adjustment mode.
Why Sr May Appear
Sr may appear when:
- Refrigerator Temperature Compensation Mode was intentionally entered
- a technician is calibrating refrigerator temperature
- a compensation value is being checked or changed
- the service adjustment mode was activated accidentally
The presence of Sr alone does not indicate a failed component.
What You Can Check
- Measure the actual refrigerator temperature. Use an appropriate refrigerator thermometer rather than relying only on the control-panel setting.
- Compare it with the selected temperature. Determine whether there is a consistent difference.
- Allow temperatures to stabilize. Refrigerator temperatures naturally fluctuate during normal operation, door openings, and defrost cycles.
- Do not change compensation values unnecessarily. Incorrect compensation can cause the refrigerator to operate consistently too warm or too cold.
- Use model-specific procedures. Available compensation settings and adjustment methods can vary between LG refrigerator models.
When Temperature Compensation Should Be Used
Before adjusting Sr, the underlying refrigeration system should be operating normally.
A technician may first need to:
- verify actual compartment temperature
- test the refrigerator thermistor
- compare sensor resistance with specifications
- check airflow
- verify fan operation
- check for abnormal frost buildup
- confirm that the refrigerator is cooling normally
Temperature compensation should not be used to hide an actual sensor, airflow, defrost, or sealed-system problem.
If the refrigerator has a significant cooling problem, the underlying fault should be diagnosed instead of correcting the temperature only through compensation.
Note: Sr is Refrigerator Temperature Compensation Mode, not an error code.
SS — Pantry Sensor Error
The SS error code on an LG refrigerator indicates a problem with the pantry temperature sensor circuit. According to LG Error Codes, the code appears when the main control board is not receiving the expected signal from the pantry sensor.
The pantry sensor monitors temperature in the pantry or temperature-controlled drawer and sends this information to the main PCB. If that signal is lost or outside the expected electrical range, the SS code may appear.
Common Causes
Possible causes include:
- failed pantry temperature sensor
- open sensor circuit
- shorted sensor circuit
- damaged or disconnected wiring
- loose sensor connector
- poor connection at the main PCB
- damaged wiring near the pantry drawer
- main control board problem
LG’s diagnostic information specifically recommends checking the wiring at both the sensor and main PCB. It also notes that the error is triggered when the main PCB detects an abnormal sensor-circuit voltage of 0 or 5 VDC.
What You Can Check
- Check pantry temperature. Determine whether the drawer is warmer or colder than its selected setting.
- Check drawer operation. Make sure the pantry drawer closes completely and nothing interferes with its normal position.
- Check for other symptoms. Unstable drawer temperatures or additional sensor codes may indicate a broader wiring or control problem.
- Restart the refrigerator. Disconnect power for approximately five minutes, restore power, and check whether SS returns.
Testing the sensor circuit itself normally requires electrical measurements and access to internal wiring.
If the SS Code Returns
If SS continues to appear, the pantry sensor circuit should be diagnosed.
A technician may need to:
- test the pantry temperature sensor
- measure sensor resistance
- inspect the sensor connector
- inspect wiring between the sensor and main PCB
- check the circuit for open or short conditions
- test wiring continuity
- verify the sensor signal at the main PCB
- evaluate the main control board if the sensor and wiring test normally
Because pantry configurations and sensor specifications vary between LG refrigerator models, resistance values and test procedures should be verified using service information for the specific model.
A persistent SS error can prevent the refrigerator from accurately monitoring and controlling the temperature of the pantry compartment.
SSt — In-Door Ice Maker Water Supply Time
The SSt display is not an error code. It indicates a water supply time adjustment mode used for the LG refrigerator’s in-door ice maker. In this service/compensation mode, the amount of time the ice maker water valve remains open during filling can be adjusted.
This setting allows the ice maker’s water fill to be fine-tuned when water pressure causes the ice tray to receive too much or too little water.
What SSt Means
The SSt setting controls the in-door ice maker water fill time in seconds.
According to the technical reference, the fill time can be:
- reduced if high household water pressure causes the ice tray to overfill
- increased if low water pressure results in the ice tray receiving too little water
SSt therefore does not indicate that the water valve, ice maker, or another refrigerator component has failed.
Why SSt May Appear
SSt may appear when:
- the water supply time adjustment mode has been intentionally entered
- an ice maker fill-time adjustment is being performed
- a technician is calibrating the in-door ice maker
- the compensation/service mode has been activated accidentally
Its presence alone does not require a repair.
What You Can Check
- Check the ice cubes. Consistently small or incomplete cubes may indicate insufficient water filling.
- Check for overfilling. Excess water or ice forming outside the normal tray area can indicate excessive fill volume.
- Check household water pressure. Water pressure affects how much water enters during a fixed fill time.
- Check the water filter and supply. A restricted filter, partially closed valve, or kinked line can reduce water flow.
- Do not change the setting unnecessarily. Incorrect adjustment can cause the ice maker to underfill or overflow.
If SSt Appears Unexpectedly
If SSt appears during normal refrigerator use, avoid changing the stored fill-time value unless you know the correct setting and adjustment procedure for the refrigerator.
If the ice maker has an actual filling problem, a technician should first determine whether the cause is:
- household water pressure
- restricted water supply
- clogged water filter
- water inlet valve problem
- ice maker problem
- incorrect water-fill calibration
Adjusting SSt should not be used to compensate for an actual failed or restricted component.
Note: SSt is a service/compensation setting, not an error code.
toc — InstaView Display Mode
The toc display is not an error code. It indicates that InstaView Display Mode has been activated on compatible LG refrigerators. This is a special demonstration mode intended primarily for refrigerators displayed in retail stores.
When this mode is active, the InstaView Door-in-Door LED follows a repeating lighting pattern rather than operating normally.
What toc Means
According to the LG error-code reference, while InstaView Display Mode is active, the InstaView light:
- turns on for approximately 10 seconds
- turns off for approximately 2 minutes and 50 seconds
- repeats this pattern continuously
This behavior is intentional and does not indicate a failure of the InstaView panel, LED lighting, or refrigerator control system.
Why toc May Appear
The toc display may appear because:
- InstaView Display Mode was intentionally activated
- the refrigerator was configured for retail demonstration
- the demonstration mode was activated accidentally
- a service or display-mode procedure was performed
The refrigerator must first be placed into OFF Demo Mode before this particular InstaView demonstration feature can be activated.
What You Can Check
- Observe the InstaView light. If it repeatedly turns on and off in the pattern described above, Display Mode is likely active.
- Check for OFF/Demo Mode. InstaView Display Mode is associated with the refrigerator’s demonstration functions.
- Do not replace components based on toc. The display itself does not indicate a failed InstaView panel or electronic component.
- Exit Display Mode. Use the appropriate procedure for the specific refrigerator model to return the appliance to normal operation.
If toc Appears Unexpectedly
If toc appears during normal household use, the refrigerator may have been accidentally placed into InstaView Display Mode.
The mode can be deactivated by repeating the activation procedure or by disabling Demo Mode. Because control configurations can vary, use the instructions appropriate for the specific LG refrigerator model.
If the InstaView system continues to behave abnormally after Display Mode has been disabled, troubleshoot that symptom separately. The toc indication itself does not identify a component failure.
Note: toc is an InstaView demonstration/display mode, not an error code.
UC — UV Module Error
The UC error code on an LG refrigerator indicates a problem with the UVnano dispenser sanitizing system on models equipped with this feature. Specifically, the code is associated with the ultraviolet LED module used to sanitize the dispenser nozzle.
The UVnano system automatically uses ultraviolet light to help keep the dispenser nozzle clean. If the refrigerator detects abnormal operation of the UV LED module or its circuit, the UC error may appear.
Common Causes
Possible causes include:
- failed UV LED module
- UV module PCB problem
- damaged or disconnected wiring
- loose electrical connector
- incorrect or missing power supply to the UV module
- UV module signal problem
- wiring problem between the UV PCB and Sub PCB
- electronic control problem
The UC code does not automatically mean the UV module itself must be replaced. The module’s power supply, ground, signal circuit, connectors, and wiring should also be checked.
What You Can Check
- Check normal dispenser operation. Determine whether water dispensing continues to work normally.
- Check the Self Care / UVnano function. On applicable models, note whether the feature activates or shows abnormal behavior.
- Look for additional error codes. Other electronic or communication errors may help identify a broader control problem.
- Restart the refrigerator. Disconnect power for approximately five minutes, restore power, and check whether UC returns.
The technical reference notes that the UV cleaning function normally runs automatically for 10 minutes every hourand can also be manually activated by holding the Self Care button for approximately three seconds on applicable models.
If the UC Code Returns
If UC continues to appear, the UVnano system should be diagnosed.
A technician may need to:
- inspect the UV LED module
- inspect the UV module PCB
- check wiring and connectors
- verify power and ground at the UV PCB
- check the module’s signal circuit
- inspect wiring between the UV module and Sub PCB
- evaluate the associated electronic control if the module and wiring test normally
The technical reference identifies 12 VDC, ground, and signal circuits at the UV module PCB, although actual diagnostic measurements should always be verified against service information for the specific refrigerator model.
A UC error is related to the UV dispenser sanitizing feature and does not by itself indicate a failure of the refrigerator’s cooling or sealed system.
UP — ThinQ UP Feature Update
The UP display is not an error code. It is a notification that an LG refrigerator equipped with ThinQ UP has a new feature update available for the appliance.
ThinQ UP allows compatible LG appliances to receive additional or updated features after purchase. When new upgradeable content becomes available, the refrigerator can display the UP notification, and the available update can then be reviewed through the LG ThinQ app.
What UP Means
When UP appears, it means:
- a new ThinQ feature update is available
- the refrigerator is notifying you about upgradeable content
- it does not indicate a failed component
- refrigerator repair is not required simply because UP is displayed
According to the technical reference, the UP segments may cycle on the display several times before the refrigerator returns to its normal display.
What Can Be Updated
Available features depend on the refrigerator model and the updates LG makes available.
Examples of refrigerator features that may be updated include:
- interior light brightness
- nighttime InstaView knock-on lighting behavior
- door-open melody
- measured water fill settings
- other compatible appliance features
Not every ThinQ UP refrigerator will receive the same features. Some upgrades may also require compatible hardware.
What You Should Do
- Open the LG ThinQ app. Check whether a new feature update is available for the refrigerator.
- Review the update. The Upgrade Center can show available content for compatible ThinQ UP appliances.
- Start the update if desired. Follow the instructions provided through ThinQ.
- Do not unplug the refrigerator during an active update. Allow the update process to complete before disconnecting power.
If no upgrade is desired immediately, the UP indication itself does not mean the refrigerator has a malfunction.
If UP Appears Unexpectedly
If UP appears while the refrigerator otherwise operates normally, there is generally no reason to troubleshoot the cooling system, sensors, fans, or control boards.
Instead, check the ThinQ app for an available feature update.
If the refrigerator has a separate operational problem—such as poor cooling, no ice production, or a dispenser issue—that symptom should be diagnosed independently. UP itself does not identify a refrigerator fault.
Note: UP is a ThinQ feature-update notification, not an error code.
On This Page
- How LG Refrigerator Error Codes Work
- What an Error Code Can Tell You
- Error Code vs. Failed Part
- Why Error Codes Vary by Model
- What to Do When a Code Appears
- Can You Clear an Error Code?
- When to Call a Professional
- Find Your LG Refrigerator Error Code
- CF – Condenser Fan Error
- CH – Sealed System High-Side Error
- CL – Sealed System Low-Side Error
- CO – Communication Error
- CO2 — Display PCB / Dispenser PCB Communication Error
- CS – Communication / Sensor Error
- dH – Defrost Heater Error
- dS – Defrost Sensor Error
- EAd – Auto Door Error
- EAS — Auto Door Reed Switch Error
- EbU – Bottom Unit / Module Error
- EC1 – Communication Error
- EFE — No Stored Error (Not an Error Code)
- Edr – Drawer Error
- EFE – Freezer Evaporator Fan Error
- EFU — No Stored Error (Not an Error Code)
- ErU — No Stored Error (Not an Error Code)
- Ett – Water Tank Switch Error
- FF – Freezer Fan Error
- FS – Freezer Sensor Error
- gF – Flow Meter Error
- HS – Humidity Sensor Error
- IC — Mini Cubed Ice Maker Motor Error
- Id – Ice Maker / Ice Detection Error
- IE — Freezer Ice Maker Error
- IF – Ice Maker Fan Error
- IH – Ice Maker Heater Error
- IO — Mini Cubed Ice Maker Temperature Sensor Error
- IS – Ice Maker Sensor Error
- It — In-Door Ice Maker Kit Error
- IU – Ice Maker Error
- Rotary Knob – Rotary Knob / Display Control
- LAS — Left Auto Drawer Reed Switch Error
- Od – Wi-Fi Modem / Communication Error
- OFF – Cooling Off / Demo Mode
- PS – Pantry Sensor Error
- rAS — Right Auto Drawer Reed Switch Error
- rF – Refrigerator Fan Error
- rS – Refrigerator Sensor Error
- rS2 – Refrigerator Sensor 2 Error
- rt – Room Temperature Sensor Error
- Sb – Sabbath Mode
- SC – Communication Error
- Sd – Pantry / Drawer Sensor Error
- SF – Refrigerator Temperature Compensation Mode
- Sr — Refrigerator Temperature Compensation Mode
- SS – Pantry Sensor Error
- SSt – System / Sensor Error
- toc – Display / Touch Control Error
- UC – Communication Error
- UP – Software Update / Update Mode
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