ErrorCodeDoctor
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. 1

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

  2. 2

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

  3. 3

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

  4. 4

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

  5. 5

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

Related LG Air Conditioner error codes

1

CH04

The indoor unit is not draining condensate water properly

easy
2

CH05

Communication between the indoor and outdoor units has been lost

medium
3

CH07

Two connected units are set to conflicting operating modes

easy
4

CH38

The air conditioner is low on refrigerant gas

hard

CH54 error — frequently asked questions

What does the CH54 error mean on a LG air conditioner?

A reverse phase or abnormal power supply was detected

What causes the CH54 error?

The CH54 error is usually caused by: 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.

Can I fix the CH54 error myself?

It's possible for a moderately handy person, but budget 5m and expect some disassembly.

How much does it cost to fix the CH54 error?

Fixing the CH54 error on a LG air conditioner typically costs $0–$150, depending on parts and whether you do it yourself or hire a technician.

Is it safe to keep using my air conditioner with the CH54 error?

In most cases yes, but it's best to address the CH54 error soon — see the fix steps below to resolve it.