LG · Air Conditioner

LG Air Conditioner CH03 error code

Difficulty: Hard · Cost: $150–$400 · Duration: Requires professional service

The CH03 error means your LG air conditioner has detected that there is no refrigerant in the system. This may also appear as E3 on some models. Refrigerant does not get consumed during normal operation so if it is gone there is a leak somewhere in the system. This is not a user-fixable issue — refrigerant work must be carried out by a licensed technician. Do not continue using the unit as running without refrigerant will damage the compressor.

Common causes

Refrigerant has leaked from the system through a crack or loose connection
Refrigerant was not correctly charged during installation
Refrigerant leak in the piping between the indoor and outdoor units

How to fix it

1

Do not attempt to use the unit — running without refrigerant will damage the compressor
2

Unplug the unit immediately
3

Contact a licensed technician to locate the leak, repair it, and recharge the refrigerant