ERROR CODE EXPLAINED
LG Air Conditioner
LG Air Conditioner CH54 Error Code
What it means
CH54 is a reverse-phase or electrical-supply detection condition that can appear after a power outage or electrical work.
Try this first
- Reset the air-conditioner circuit breaker.
- If the code appeared after electrical work, contact the electrical contractor and report the reverse-phase detection error.
- If the code remains, arrange inspection or service.
Can I keep using it?Follow the manufacturer checks that match the condition shown by the appliance; model-specific details can vary.
Repair usually required?If the manufacturer directs the issue to service or the listed checks do not clear it, arrange professional appliance service.
If the error keeps returning
Use the linked official manufacturer support article for the exact source guidance and model-specific details.
Official source
Troubleshooting information verified against manufacturer support documentation.
View manufacturer support page →Safety note:ApplianceSignal provides general troubleshooting information. Always follow the appliance manufacturer's safety instructions and disconnect power when required.