LG Air Conditioner error codes

CH01

A fault was detected in the indoor pipe temperature sensor

CH02

A short or open circuit was detected in the indoor pipe sensor

CH03

No refrigerant detected — the unit is out of refrigerant gas

CH04

The indoor unit is not draining condensate water properly

CH05

Communication between the indoor and outdoor units has been lost

CH07

Two connected units are set to conflicting operating modes

CH10

The indoor unit fan has detected a fault and cannot operate properly

CH237

The outdoor unit is not receiving power and cannot communicate with the indoor unit

CH38

The air conditioner is low on refrigerant gas

CH54

A reverse phase or abnormal power supply was detected

CH61

The outdoor unit overheated during cooling or the indoor unit overheated during heating

CH66

A fault was detected in the communication line or piping connection between the indoor and outdoor units

CH67

The outdoor unit fan has detected a fault and cannot operate properly

CH90

A fault was detected during the test run phase to protect the unit from damage

CH93

Communication between the indoor and outdoor units is unstable or has failed

E4

The unit has entered defrost mode to melt ice on the evaporator

P2

The drain pan inside the unit is full and needs to be emptied