When a problem arises, LG refrigerators display error codes to alert the user to the issue. In this guide, we will cover error codes for all models of LG refrigerators, including 3-door, 4-door, French door fridges, LG InstaView Door-in-Door, side-by-side refrigerators, and multi-door with Smart ThinQ, among others.
By understanding these error codes, you can troubleshoot issues with your LG fridge and get it running smoothly again.
Error codes on LG refrigerators explained!
Remember to always unplug the refrigerator and exercise caution when attempting any repairs.
E AS: Auto-door switch error.
The AS error indicates a problem with the auto-door Reed Switch operation.
Related error codes:
- L AS: Left auto drawer switch error
- I LS: Smart auto drawer switch error
- r AS: Right auto drawer switch error
Causes:
- Faulty door switch
- Faulty wire harness connector
- Faulty main board
Solutions:
- Check the wire harness on the main board.
- Check the door Reed-switch using a multimeter and magnet.
- If the error still occurs, check the mainboard and replace it if necessary.
E CO: Communication failure
The CO error indicates a problem with the communication between the mainboard and the user interface board.
Causes:
- Disconnection at the boards or at the hinge
- Faulty harness connections
- Faulty main board
- Faulty user interface board
Solutions:
- Check the connections at the user interface and the main board.
- Check the harness between the user interface and main board.
- Check the UI board and replace it if necessary.
- Check the main board and replace it if necessary.
E C1: Dispenser communication error
The C1 error indicates a problem with the communication between the dispenser and the user interface board.
Causes:
- Faulty harness connections
- Faulty dispenser board
- Faulty user interface board
Solutions:
- Check the connections on the display.
- Check the harness between the dispenser and user interface board.
- Check the dispenser board and replace it if necessary.
- Check the user interface board and replace it if necessary.
E CF: Condenser fan error
The CF error indicates a problem with the cooling fan. This fan cools the condenser to allow proper condensation of the refrigerant; a fan failure increases the compressor activity to keep the temperature at the requested level.
Eventually the temperature inside will rise, and causes a decrease in the performance of the refrigerator.
Causes:
- Faulty harness connection
- Faulty condenser fan motor blade
- faulty condenser fan motor
- Faulty main board
Solutions:
- Check the condenser fan wire harness connector.
- Check the harness on the main board.
- Check if the fan can rotate freely.
- Once you identify obstacles, remove them.
- Check the condenser fan voltage test point.
- Main voltage: VCC “V” and GND “G”.
- Feedback voltage: GND “G” and FG “F”.
- PWM voltage: PWM and GND “G”.
| Electric part name | Main voltage | Feedback voltage | PWM voltage |
|---|---|---|---|
| Condenser fan | ~ 12 Vdc | ~ 2.4 Vdc | 1.2 to 4.6 Vdc |
| Electric part name | Main voltage | Feedback voltage |
|---|---|---|
| Condenser fan | ~ 12 Vdc | ~ 2.4 Vdc |
- Check the main board and replace it if necessary.
E FF: Freezer fan error
The FF error indicates a problem with the freezer cabinet fan.
Causes:
- Faulty harness connection
- Faulty freezer fan motor blade
- faulty freezer fan motor
- Faulty main board
Solutions:
- Check the freezer fan wire harness connector.
- Check the harness on the main board.
- Check if the fan can rotate freely.
- Once you identify obstacles, remove them.
- Verify the freezer fan voltage test point.
- Main voltage: VCC “V” and GND “G”.
- Feedback voltage: GND “G” and FG “F”.
- PWM voltage: PWM and GND “G”.
| Electric part name | Main voltage | Feedback voltage | PWM voltage |
|---|---|---|---|
| Freezer fan | ~ 12 Vdc | ~ 2.4 Vdc | 1.2 to 4.6 Vdc |
| Electric part name | Main voltage | Feedback voltage |
|---|---|---|
| Freezer fan | ~ 12 Vdc | ~ 2.4 Vdc |
- Check the main board and replace it if necessary.
E rF: Refrigerator fan error
The rF error indicates a problem with the fridge cabinet fan.
Causes:
- Faulty harness connection
- Faulty refrigerator fan motor blade
- faulty refrigerator fan motor
- Faulty main board
Solutions:
- Check the refrigerator fan wire harness connector.
- Check the harness on the main board.
- Check if the fan can rotate freely.
- Once you identify obstacles, remove them.
- Verify the refrigerator fan voltage test point.
- Main voltage: VCC “V” and GND “G”.
- Feedback voltage: GND “G” and FG “F”.
- PWM voltage: PWM and GND “G”.
| Electric part name | Main voltage | Feedback voltage | PWM voltage |
|---|---|---|---|
| Refrigerator fan | ~ 12 Vdc | ~ 2.4 Vdc | 1.2 to 4.6 Vdc |
| Electric part name | Main voltage | Feedback voltage |
|---|---|---|
| Refrigerator fan | ~ 12 Vdc | ~ 2.4 Vdc |
- Check the main board and replace it if necessary.
E IF: Ice maker fan error
The rF error indicates a problem with the ice maker fan.
Causes:
- Faulty harness connection
- Faulty ice maker motor blade
- faulty ice maker motor
- Faulty main board
Solutions:
- Check the ice maker fan wire harness connector.
- Check the harness on the main board.
- Check if the fan can rotate freely.
- Once you identify obstacles, remove them.
- Verify the ice maker fan voltage test point.
- Main voltage: VCC “V” and GND “G”.
- Feedback voltage: GND “G” and FG “F”.
- PWM voltage: PWM and GND “G”.
| Electric part name | Main voltage | Feedback voltage | PWM voltage |
|---|---|---|---|
| Ice maker fan | ~ 12 Vdc | ~ 2.4 Vdc | 1.2 to 4.6 Vdc |
- Check the main board and replace it if necessary.
F dH: Defrost heater error
The dH error indicates a possible defrost failure. Specifically, the temperature measured by the defrost sensor hasn’t exceeded 5°C within 1 hour and 20 minutes after the defrost cycle began. This suggests that the evaporator may be experiencing excessive ice buildup, potentially leading to a blockage.
Causes:
- Faulty harness connection
- Faulty defrost heater thermal-fuse
- Faulty defrost heater
- Faulty main board
Solutions:
- Check the defrost heater wire harness connector.
- Check the defrost heater and thermal-fuse resistance using a multimeter.
| Electric part name | Ohmic value | Abnormal value |
|---|---|---|
| Defrost heater | ~ 50 Ω | OL | ∞ Ω |
| Thermo-fuse | 76°C / 169°F @ 0.1 – 1.2 Ω | OL | ∞ Ω |
- Check the main board and replace it if necessary.
E dL: Left auto drawer module error
The dL error indicates a problem with the auto drawer motor on the left side, which did not move to its correct and/or home position within 5 seconds.
Related error codes:
- E dr: Right auto drawer module error
- E Ad: Auto door module error
- I Ld: Auto smart drawer module error
- U Ld: Smart auto-lift module error
- U LS: Smart auto-lift switch error
Causes:
- Faulty harness connection
- Faulty Hall sensor
- Faulty drawer motor
- Faulty drawer module connection
- Faulty main board
Solutions:
- Check the module wire harness connector.
- Check the hall sensor.
| Electric part name | Ohmic value between Black and Red wire |
|---|---|
| Hall sensor | 17400 Ω |
- Does the hall sensor receive between +5 and 10 volts?
- If yes, replace the hall sensor.
- If not, replace the main board.
- Check the drawer motor.
- Check the drawer module.
- Check the main board and replace it if necessary.
F dS: Defrost sensor error
The dS error indicates a problem with the defrost temperature detection, and as a result, the evaporator can be blocked with ice frost.
Causes:
- Faulty wire harness
- Sensor connector disconnected:
- Short/open circuit
- Faulty D. sensor
- Faulty main board
Solutions:
- Check the defrost sensor wire harness connector.
- Check the connections on the main board.
- Check the defrost sensor resistance using a multimeter.
| Electric part name | Temperature | Ohmic value |
|---|---|---|
| Defrost sensor | 25°C/77°C | 9800 Ω |
- Check the main board.
E FS: Freezer sensor error
The FS error indicates a problem with the freezer temperature detection.
Causes:
- Faulty wire harness
- Sensor connector disconnected:
- Short/open circuit
- Faulty freezer sensor
- Faulty main board
Solutions:
- Check the freezer sensor wire harness connector.
- Check the connections on the main board.
- Check the freezer sensor resistance using a multimeter.
| Electric part name | Temperature | Ohmic value |
|---|---|---|
| Freezer sensor | 25°C/77°C | 2300 Ω |
- Check the main board.
E rS: Refrigerator sensor error
The rS error indicates a problem with the refrigerator side temperature detection (R1, upper part).
Related error code:
- E r2: Refrigerator Sensor 2 error
Causes:
- Faulty wire harness
- Sensor connector disconnected:
- Short/open circuit
- Faulty refrigerator sensor
- Faulty main board
Solutions:
- Check the sensor wire harness connector.
- Check the connections on the main board.
- Check the refrigerator sensor resistance using a multimeter.
| Electric part name | Temperature | Ohmic value |
|---|---|---|
| Refrigerator sensor | 25°C/77°C | 9800 Ω |
- Check the main board.
E HS: Humidity sensor error
The HS error indicates a problem with the room humidity detection.
Causes:
- Faulty wire harness
- Sensor connector disconnected:
- Short/open circuit
- Faulty humidity sensor
- Faulty main board
Solutions:
- Check the humidity sensor wire harness connector.
- Check the connections on the main board.
- Check the humidity sensor voltage using a multimeter.
- Check the main board.
E rt: Room temperature sensor error
The RT error indicates a problem with the room ambient temperature sensor.
Causes:
- Faulty wire harness
- Sensor connector disconnected:
- Short/open circuit
- Faulty room temperature sensor
- Faulty main board
Solutions:
- Check the sensor wire harness connector.
- Check the connections on the main board.
- Check the room temperature sensor resistance using a multimeter.
| Electric part name | Temperature | Ohmic value |
|---|---|---|
| Ambient temperature sensor | 25°C/77°C | 9800 Ω |
- Check the main board.
E Id: Craft ice maker sensor error
The Id error indicates a problem with the craft ice maker temperature sensor.
Causes:
- Faulty wire harness
- Sensor connector disconnected:
- Short/open circuit
- Faulty craft ice maker sensor
- Faulty main board
Solutions:
- Check the humidity wire harness connector.
- Check the connections on the main board.
- Check the craft I/M sensor resistance using a multimeter.
- Check the main board.
E IS: Ice maker sensor error
The IS error indicates a problem with the ice maker temperature detection, and as a result, the ice maker can be blocked as the cubes are no longer dispensed in the collector.
Causes:
- Faulty wire harness
- Sensor connector disconnected:
- Short/open circuit
- Faulty I/M sensor
- Faulty main board
Solutions:
- Check the humidity wire harness connector.
- Check the connections on the main board.
- Check the I/M sensor resistance using a multimeter.
- Check the main board.
E IU: Craft ice maker unit error
The IU error indicates a problem with the craft ice maker stepper motor, hall sensor, or one of the craft ice maker heaters.
Causes:
- Faulty Craft Ice maker stepper motor, hall IC or heater
- Faulty wire harness connector
- Faulty main board
- Faulty display board
Solutions:
- Check the Craft Ice Maker Assembly:
- Stepper Motor.
- Hall Sensor.
- Craft Sensor.
- Heater.
- Check the main board.
- Check the display board.
E It: Ice Maker Unit error
The It error indicates a problem with the ice maker motor assembly.
Causes:
- Overloaded ice bin
- Disconnected ice maker unit
- Damaged ice maker unit motor or hall IC
- Faulty main board
Solutions:
- Check the I/M motor wire harness connector.
- Check the connections on the main board.
- Check the ice maker motor voltage with a multimeter and replace it if necessary.
- Check the user interface board and replace it if necessary.
- Check the main board.
OFF: Demo Mode notification
The OFF code is a notification that the appliance is running in showroom mode (shop mode, demo mode, etc.).
Solutions:
- Method 1: Press and hold the REFRIGERATOR button and tab Express FRZ Three times, a ‘Ding’ sound will be heard to indicate that demo mode has been successfully deactivated.
- Method 2: Press and hold the ‘REFRIGERATOR’ and ‘Express FRZ’ buttons simultaneously for 3 seconds. A ‘Ding’ sound will be heard to indicate that demo mode has been successfully deactivated.
It is recommended to verify the LG appliance’s user manual because each refrigerator requires its own settings.
Sb: Sabbath Mode notification (Same as S6, 5b or 56)
The Sb code is observed during the Jewish Shabbat and holidays, and it involves the restriction of certain activities.
Solutions:
- To turn on Shabbat mode, you can either press and hold the SMART GRID and FREEZER buttons together for 3 seconds.
- To turn off Shabbat mode, you can repeat the process or wait for it to turn off automatically after 96 hours.
- While the refrigerator is in Shabbat mode, certain functions such as temperature adjustments, lighting, alarm functions, an ice and water dispenser, and Wi-Fi may be disabled.
It is recommended to verify the LG appliance’s user manual because each refrigerator requires its own settings.
E CH: High Side Cycle leakage warning
Related error code:
- E CL: The CL error code indicates a refrigerant leak on the low-pressure side of the sealed system
CH Error Code: Refrigerant Leak in the High-Pressure System
Understanding the issue:
- The CH error code signals a refrigerant leak, specifically within the high-pressure side of the sealed system.
- Potential causes include:
- Faulty 3-way valves
- General leaks in refrigerant lines or components
- Detection methods:
- Abnormal temperature readings
- Abnormal compressor feedback signals
Urgency of Addressing the Issue:
- Prompt attention is crucial for several reasons:
- Efficiency and Performance: Refrigerant leaks compromise the system’s ability to function effectively, leading to reduced cooling capacity and potential compressor damage.
- Further Damage Prevention: Unaddressed leaks can worsen, causing more extensive and costly repairs.
- Safety Hazards: Refrigerant leaks pose risks such as:
- Reduced air quality
- Fire hazards (in extreme cases)
- Environmental concerns (due to refrigerant emissions)
Recommendations:
- Avoid DIY Attempts: Refrigerant handling is best left to LG technicians to ensure safety and regulatory compliance.
E FU: Failing unit error
The FU error message indicates that there is a problem with the temperature in the freezer compartment of your appliance. Some possible causes of this error include the appliance not being at the proper temperature, the door not closing properly, an insufficient cooling process, a faulty thermistor, or a faulty main board. To troubleshoot this issue, you can try the following solutions:
- Make sure that the appliance is turned on, the compressor is running, and the cooling and freezing temperatures are normal.
- Check the freezing temperature and make sure it is set to -18 °C.
- Keep track of how often and for how long the door is open, as this can affect the cooling capacity.
- Ensure that the food is not blocking the air vents and that the cold air can flow through the storage area.
- Check that the door closes and seals properly, using a piece of paper to test the closing force of the door gaskets.
E gF: Flow meter sensor error
The gF error message indicates that there is a problem with the appliance’s water flow sensing detection. Some possible causes of this error include a closed water supply or kinked tube, a faulty flow meter, a sensor disconnection or short circuit, a faulty main board, or incorrect water pressure. To troubleshoot this issue, you can try the following solutions:
- Make sure that the water tap is fully open and the water is flowing properly to the appliance through the tube (without any kinks).
- Check the water pressure to ensure it is within the proper range.
- Check the flow meter’s specifications and make sure that it is operating within the proper range.
| Electric part name | Ohmic value between Black and Red wire |
|---|---|
| Hall sensor | 17.4 KΩ |
E gS: Gas sensor error
The gS error message indicates that there is a problem with the gas sensing detection in the appliance. It is important to note that the gas sensing system is used to control the activation of the PureNFresh ventilation system.
Hi: High Room Temperature notification
The Hi error is a notification that the room temperature has exceeded +50 °C.
related error code:
- Lo: The Lo error is a notification that the room temperature has fallen below -10 °C.
Solution:
- You should wait until the ambient temperature matches the climate class of the refrigerator before using it.
LG refrigerator in all-on mode.
ALL ON mode is a function that allows you to discover error codes stored in the refrigerator’s memory.
Note: Once the fridge has been fixed, the error code will automatically disappear.
How to activate ALL ON mode
To activate the ‘ALL ON’ mode, press and hold the FREEZER and Express FRZ buttons simultaneously for 3 seconds.
I am a master Appliance Repair technician with over 35 years of experience in the field. I am passionate about helping people troubleshoot their appliances and fix common problems. My website, appliancemode.com, provides a wealth of information on troubleshooting common appliance issues and deciphering error codes. This website aims to empower people to tackle appliance repairs themselves and save money on service calls.
