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Error code reference
LG Heat Pump Error Code CH53
Bad communication between Indoor unit and Outdoor unit (outdoor-side code for CH05).
SourceLG AH Series Heat Pump - Service Manualp. 61, 64
Diagnostic procedure
The full CH53 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
1
First diagnostic step
Check transmission cable connections at indoor/outdoor terminal blocks; check main power supply; check insulation of inverter.
SourceLG AH Series Heat Pump - Service Manualp. 61, 64
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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