LG · Air Conditioner

LG Air Conditioner CH54 error code

Difficulty: Medium · Cost: $0–$150 · Duration: 5m

The CH54 error means your LG air conditioner has detected an issue with the electrical phase supply coming into the unit. This typically happens after a power outage, when power is restored with the phase in the wrong order, or after electrical work has been carried out on the property. The unit stops running as a protective measure. Resetting the circuit breaker clears it in most cases. If the error appeared after electrical work the contractor who did the work will need to be informed so they can correct the wiring.

Common causes

Power was restored after an outage with the electrical phase in the wrong order
Electrical work carried out on the property resulted in incorrect phase wiring
Unstable or abnormal power supply reaching the unit

How to fix it

1

Turn off the air conditioner circuit breaker and wait a few minutes
2

Switch the circuit breaker back on and check if the error has cleared
3

If CH54 appeared after electrical work on your property contact the contractor who did the work
4

Inform them of a reverse phase detection error so they can inspect and correct the wiring
5

If the error persists after resetting and no electrical work was done contact a technician for inspection