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LG Air Conditioner - Troubleshooting A CH05 Error Code: Causes

A CH05 error code on your air conditioner indicates a communication error between the outdoor and indoor unit.

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TroubleshootingAir Conditioners

What to Check First

  1. A CH05 error code on your air conditioner indicates a communication error between the outdoor and indoor unit.
  2. 1 If the circuit breaker for the outdoor unit is tripped, turn off the circuit breaker for the indoor unit as well for 5 minutes.
  3. 2 After 5 minutes, turn on both circuit breakers on at the same time and retry.
  4. If the error code persists, service will be required. Please visit our LG HVAC page to locate a servicer in your area.

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 LG Air Conditioner - Troubleshooting A CH05 Error Code?

A CH05 error code on your air conditioner indicates a communication error between the outdoor and indoor unit.

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.

Buying Guides for This Product Type

Efficiency & running costAir Conditioner Efficiency, Energy & Running-Cost GuideHousehold use caseAir Conditioner Family & High-Use Household GuideFeatures & valueAir Conditioner Features Worth Paying For — Value GuideFit & installationAir Conditioner Fit, Installation & Delivery Planning

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Read the Official LG Guide