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: turning the air conditioner off and the back on too quickly, dirty or restricted condenser coil, compressor failure
Main causes: dirty air filter, air conditioner is too small for the room, temperature set too cold, control failure
Main causes: bad compressor, lack of refrigerant, bad compressor start relay, electronic control board failure
Main causes: clogged condensate drain, air conditioner not leveled properly, leaky window air seals
Main causes: lack of electrical power, bad electronic control board, wiring failure, bad temperature sensor
Main causes: clogged drain hole, air conditioner not leveled properly

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 yourself following these instructions.

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 it.

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.

October 26, 2016

How to repair broken or damaged wires video

By Sears PartsDirect staff

Learn how to repair broken, frayed or damaged wires in your appliances.

January 20, 2015

How to fix a smelly room air conditioner

By Sears PartsDirect staff

Learn how to remove and prevent odors in a window air conditioner.

December 22, 2014

Room air conditioner installation and operation tips

By Sears PartsDirect staff

Window air conditioner installation tips.