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How to Troubleshoot Error Codes CH03 and CH04 on Your LG

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.

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TroubleshootingAir Conditioners

What to Check First

  1. Do not disassemble the air conditioner or replace internal parts yourself. Doing so may cause fire, electric shock, serious injury, or death.
  2. If the error code persists, stop using the air conditioner and contact LG Support.
  3. 1. Turn off power to the air conditioner at the circuit breaker.
  4. 2. Wait about five minutes.
  5. 3. Restore power at the circuit breaker.
  6. 4. Check whether the error code has cleared.
  7. 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.
  8. 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.
  9. 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.
  10. This guide is based on standard models. The settings menu may vary by model.

Why This Can Happen

Symptoms can have more than one cause, and the correct steps depend on the exact model, installation and operating conditions. Use the checks above to narrow the issue before service.

Safety and Model-Specific Guidance

Stop troubleshooting if you notice burning, electrical damage, unsafe heat, gas odor, refrigerant concerns, or water near electrical components. Follow the official LG USA instructions for your exact model.

Frequently Asked Questions

What should I check first for How to Troubleshoot Error Codes CH03 and CH04 on Your LG Ceiling-Mounted Air Conditioner?

Do not disassemble the air conditioner or replace internal parts yourself. Doing so may cause fire, electric shock, serious injury, or death.

When should I stop troubleshooting and contact LG?

Stop if the product shows signs of electrical damage, burning, leaking near electrical components, or if the recommended checks do not resolve the issue. Use LG USA support for model-specific service guidance.

Does this guidance apply to every LG model?

Not always. Controls, error codes and service steps can differ by model. Confirm the exact model number and follow the linked LG USA article for model-specific instructions.

Related LG Products

These model pages are linked because the stored category or exact model matches this Help Library topic.

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Read the Official LG Guide