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LG window air conditioner error codes
These error code explanations can help you diagnose a problem with your LG window air conditioner. For repair how-to help, visit the PartsDirect repair help section, which includes repair help for window air conditioners, major appliances, lawn and garden equipment, garage door openers, vacuum cleaners and more. Search for your model number to find a complete list of replacement parts for your window air conditioner.
Error Code
Condition
DIY advice
E1
Temperature sensor failure
Check/Repair
Unplug the air conditioner and check the wire harness connections on the electronic control board. Examine the electronic control board for damage. Check for a pinched or broken wire in the temperature sensor wire harness. Replace the temperature sensor if it's defective.
Possible parts
Temperature sensor, Wire harness, Electronic control board
E2
Failure in the indoor temperature sensor
Check/Repair
Unplug the air conditioner and check the wire harness connections on the electronic control board. Examine the electronic control board for damage. Check for a pinched or broken wire in the indoor temperature sensor wire harness. Replace the indoor temperature sensor if it's defective.
Possible parts
Indoor temperature sensor, Wire harness, Electronic control board
E3
Abnormal operation protection error
Check/Repair
Unplug the air conditioner and check the wire harness connections on the electronic control board. Examine the electronic control board for damage. Check for a pinched or broken wire in the indoor temperature sensor wire harness. Replace the indoor temperature sensor if it's defective.
Possible parts
Indoor temperature sensor, Wire harness, Electronic control board
E3
Abnormal operation protection error
Check/Repair
Clean or replace filters if dirty. Unplug the window air conditioner and check all components for visible damage. Check fan blades for damage or obstructions and replace any damaged fan blades. Check all wire harness connections. Replace any damaged wire harnesses.
Possible parts
Filter, Fan blade, Fan motor, Wire harness
E4 (Portable A/C only)
Air conditioner is in the defrost mode
Check/Repair
After the air conditioner exits defrost mode and resumes normal operation, check the unit to see if it's cooling properly. If so, then the E4 code is normal. If the portable air conditioner frequently goes into the defrost mode and isn't cooling properly, check the air filters and clean or replace filters if dirty.
Possible parts
Filter
P2 or FL (Portable A/C only)
Water collection tank is full
Check/Repair
Empty the water collection tank. If the P2 or FL code appears when the tank is empty, replace the float switch or sensor in the collection tank.
Possible parts
Collection tank float switch or sensor
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