[LG air conditioner error codes] Check codes CH90/91

Causes and Symptoms

• A CH90 (or CH91) error is displayed.

In case of a CH90 or CH91 error, a check code is displayed to protect the product, mainly at the Test Run stage.

Try this

Is the product newly installed?

After installation, it is necessary to check the pipe connection status.
At first, it should be checked by an installation service technician.
Check if there is contact information for the installation service technician on the business card you received at the time of installation or on the side of the product.
Ask the installation service technician for a precise inspection.

Did CH90 or CH91 occur while using the product rather than on a new installation or relocation?

➔ Disconnect the power cord of the product or trip the exclusive circuit breaker and connect the power cord again or reset the circuit breaker again after approximately 5 minutes.

An error code that occurs in the product may be a temporary error due to unstable electricity supply or other electrical factors.

※ If the same error occurs again after resetting the power, it should be checked by a service technician for a precise inspection.

This guide was created for all models, so the images or content may be different from your product.