Error code reference

LG Heat Pump Error Code CH05

Bad communication between Indoor unit and Outdoor unit.

SourceLG AH Series Heat Pump - Service Manualp. 60, 64

Diagnostic procedure

The full CH05 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 if outdoor PCB LED is blinking; verify main power supply at ODU terminal block; check transmission cable connections at indoor/outdoor terminal blocks.

SourceLG AH Series Heat Pump - Service Manualp. 60, 64

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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

1 manual in the MyPros+ library documents this code for LG heat pump.

Models covered by the manuals that document this code

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The full CH05 procedure

Where this code is documented

Models covered by the manuals that document this code

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