Error code reference

LG Air Conditioner Error Code CH03

Communication error between wired remote controller and indoor unit (connector connection error, faulty PCB/remote controller, or connection wire break).

SourceLG Ceiling Duct Air Conditioner - Service Manual (LBUH602RSA2)p. 59

LG codes LG air conditioner codes

Diagnostic procedure

The full CH03 procedure

Step 1 is visible so you can confirm you are on the right page. The remaining steps, the ones that tell you whether to actually replace a part, unlock with any pass.

MyPros+ · DiagnosticsStep 1 preview

First diagnostic step

Check wire connection for open/short/miswiring; verify main PCB voltage DC 12V and DC 5V; check for noise interference.

SourceLG Ceiling Duct Air Conditioner - Service Manual (LBUH602RSA2)p. 59

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More steps, wiring diagram references, and verified part numbers

Includes expected resistance and voltage values, connector pinouts, and supersession notes for replacement parts.

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Where this code is documented

29 manuals in the MyPros+ library document this code for LG air conditioner.

Models covered by the manuals that document this code

More models are covered than are listed here.

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The full CH03 procedure

Where this code is documented

Models covered by the manuals that document this code

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