Help library: How to Troubleshoot Error Codes CH03 and CH04 on Your LG Ceiling-Mounted Air Conditioner

Error code CH03 indicates a problem with your wired remote control, and CH04 indicates a drainage problem.
Reset your air conditioner to clear the error.
If the error code persists, contact LG Support for service.

Warning

Do not disassemble the air conditioner or replace internal parts yourself. Doing so may cause fire, electric shock, serious injury, or death.
If the error code persists, stop using the air conditioner and contact LG Support.

Why Does Error Code CH03 or CH04 Appear?

Your air conditioner displays an error code when its self-diagnostic system detects a problem.
Error code CH03 indicates a wired remote control problem caused by a faulty remote, wiring issues, or a main circuit board error.
Error code CH04 indicates a drainage problem caused by a malfunctioning drain pump, a blocked or upward-sloping drain hose, or a dirty filter.

How to Troubleshoot the Error Codes

Step 1. Reset the Power

1. Turn off power to the air conditioner at the circuit breaker.
2. Wait about five minutes.
3. Restore power at the circuit breaker.
4. Check whether the error code has cleared.

Step 2. Still Need Help?

If the issue persists after following the steps above, you can get further support through LG Chatbot on our website or by requesting a technician visit.

Frequently Asked Questions (FAQ)

Q. The Error Code Disappeared After I Reset the Air Conditioner. Can I Continue Using It?: A. You can continue using your air conditioner. The error may have been caused by a temporary power or communication issue.
If the error code persists, stop using your air conditioner and contact LG Support. A repeated error may indicate an internal circuit or wiring problem.

Q. How Can I Help Prevent These Error Codes?: A. To help prevent a CH03 error, keep liquids, dust, and debris away from the wired remote control.
To help prevent a CH04 error, clean the filter every two weeks and ensure the drainage path is not blocked.

This guide is based on standard models. The settings menu may vary by model.

How to Troubleshoot Error Codes CH03 and CH04 on Your LG Ceiling-Mounted Air Conditioner