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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
Symptoms for window air conditioners
Choose a symptom to see related window air conditioner repairs.
Main causes: clogged condensate drain, air conditioner not leveled properly, leaky window air seals …
Main causes: bad compressor, lack of refrigerant, bad compressor start relay, electronic control board failure…
Main causes: turning the air conditioner off and the back on too quickly, dirty or restricted condenser coil, compressor…
Main causes: dirty air filter, air conditioner is too small for the room, temperature set too cold, control failure…
Main causes: clogged drain hole, air conditioner not leveled properly…
Main causes: lack of electrical power, bad electronic control board, wiring failure, bad temperature sensor…
Repair guides for window air conditioners
These step-by-step repair guides will help you safely fix what’s broken on your window air conditioner.
How to replace a window air conditioner ambient thermistor
If your window air conditioner isn’t cooling properly, it might need a new ambient thermistor. You can replace it yourse…
Repair difficulty
Time required
45 minutes or less
How to replace a window air conditioner user interface control board
Control buttons or lights on the user interface control board can stop working. This repair guide shows how to replace i…
Repair difficulty
Time required
30 minutes or less
How to replace a window air conditioner electronic control board
The electronic control board is the brain of your window air conditioner. Here’s how to replace it.…
Repair difficulty
Time required
45 minutes or less
Articles and videos for window air conditioners
Use the advice and tips in these articles and videos to get the most out of your window air conditioner.
Learn about all the convenient features on our Sears PartsDirect website that make your parts purchases easier.…
Get answers to frequently asked questions about Sears and Sears PartsDirect.…
Window air conditioner installation tips.…