ERROR CODE EXPLAINED
LG Air Conditioner
LG Air Conditioner CH04 Error Code
What it means
LG identifies CH04 as a condensate-drainage condition; on ceiling units it can indicate an indoor drain problem, while window and portable units may show it when condensate accumulates.
Try this first
- For a ceiling-type unit, disconnect power or turn off the breaker for 5 minutes, then restore power.
- For a window or portable unit that needs draining, power it off and unplug it, place a container of about 1.5 liters at the lower rear drain port, remove the drain cap, and drain the condensate.
- Securely reinstall the drain cap after draining.
- If CH04 keeps returning on dry days or remains after the reset, 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.