April 19, 2023

LG window air conditioner error codes

LG

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: bad compressor, lack of refrigerant, bad compressor start relay, electronic control board failure…

Main causes: clogged drain hole, air conditioner not leveled properly…

Main causes: clogged condensate drain, air conditioner not leveled properly, leaky window air seals …

Main causes: dirty air filter, air conditioner is too small for the room, temperature set too cold, control failure…

Main causes: turning the air conditioner off and the back on too quickly, dirty or restricted condenser coil, compressor…

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

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
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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

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