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. You can also search for owner's manuals and find window air conditioner replacement parts

Check out our window air conditioner error code charts for information on a different brand of window air conditioner.

Error Code Condition Check/Repair Shop Parts
E1 Temperature sensor failure 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.
See the repair guide to fix it yourself
Temperature sensor, Wire harness, Electronic control board
E2 Failure in the indoor temperature sensor 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.
Indoor temperature sensor, Wire harness, Electronic control board
E3 Abnormal operation protection error 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.
See the repair guide to fix it yourself
Indoor temperature sensor, Wire harness, Electronic control board
E3 Abnormal operation protection error 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.
Filter, Fan blade, Fan motor, Wire harness
E4 (Portable A/C only) Air conditioner is in the defrost mode 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.
Filter
P2 or FL (Portable A/C only) Water collection tank is full 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.
Collection tank float switch or sensor