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Error Codes - Room Air Conditioner

Troubleshooting Air Conditioners Last Updated 08/16/2016

Select the error code from the list below that is appearing on the air conditioner's display:


Note: If you are calling about a split unit or duct free air conditioner, they are considered buisness units and will not be covered in this article, please visit http://www.lg-dfs.com/product-support.aspx for further support or call 1-877-523-7222.


  • This is code displays when the Safety Relay causes the unit to power down, due to abnormal pressure in the sealed system. This is not a defect, but designed to protect the unit from overheating.

    To reduce the risk of the unit overheating, do the following:

    1. Install an awning over the air conditioner to shade the unit from direct sunlight and weather conditions.
    2. Clean the condenser coils regularly to maintain proper airflow.
    3. Instead of shutting the air conditioner completely off when away from the home, raise the temperature to a higher setting. This will allow the air conditioner to maintain better cooling and humidity control, while reducing the strain on the unit when the temperature is turned back down for more cooling.
  • The E1 or CH02 error code is an Auto-Stop Protection Error resulting from a short or open circuit in the indoor pipe sensor.

    The unit will require repair service.

  • The E2 or CH01 error code is an Auto-Stop Protection Error resulting from a short or open circuit in the indoor air sensor.

    The unit will require repair service.

  • The E3 or CH03 error code displays when the unit has detected that there is no refrigerant.

    The unit will require repair service.

  • The E4 display is not actually an error code, but indicates that the air conditioner has entered defrost mode. This occurs when the unit detects ice on the evaporator which located behind the front grille. Once defrosted, the air conditioner will resume normal operation.

  • The EA error code indicates that the unit has detected a software issue.

    The unit will require repair service.

  • The P2 or FL error code (depending on model) indicates that the drain pan in the unit is full.

    Under normal operating conditions, the drain pan will not need to be emptied. The unit is designed with a slinger fan that is mounted above the drain pan. This fan picks up the water and slings it on to the condenser to help discharge heat. There is usually not enough water in the drain pan to cause the air conditioner to shut off.

    Select the condition from the list below in which the P2 or FL error code displays:

    • If the P2 or FL error code appears on the air conditioner's display but the unit continues to run, the unit will require repair service.

    • If the P2 or FL error code is displaying on the air conditioner, remove the drain port cap and tilt the air conditioner to the back so the water runs out of the drain outlet.

      Drain Port 1

      If the unit is in COOL mode and the P2 or FL error code keeps coming back, this indicates that the room is very humid and the unit is working well.

      To drain the unit less frequently, turn the fan speed to LOW. This will slow the air circulation in the room and, thus, the amount of moisture the unit removes. Also, make sure all doors and windows are shut in order to create a controlled environment.

      If the unit is in DRY mode, the unit is running primarily to remove moisture from the air. Change to the setting to COOL mode to reduce the amount of moisture being removed from the room. Some models may allow a hose to be connected for continuous drain. Refer to the model-specific owner's manual for details.

    • If the P2 or FL error code is displaying on the air conditioner, remove the drain port cap and tilt the air conditioner to the back so the water runs out of the drain outlet.

      Drain Port 2

      If no water is draining out when the air conditioner is tilted to the back, the unit will require repair service.

    • If after tilting the unit to the back to drain the P2 or FL error code remains, perform a reset on the air conditioner.

      To perform a reset:

      1. Unplug the air conditioner, leaving it unplugged for at least 10 seconds.

      2. Plug the air conditioner back in.

      3. Press the POWER button to turn the air conditioner back on.

      If the P2 or FL error code appears after performing a reset, the unit will require repair service.

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