Error code reference

LG Heat Pump Error Code CH73

AC input instant over current error: inverter PCB input power current over 48A peak for 2ms.

SourceLG AH Series Heat Pump - Service Manualp. 61, 82

Diagnostic procedure

The full CH73 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 installation condition (pipe clogging, covering, EEV defect, refrigerant overcharge); check input voltage (220V±10%); check AC input and compressor wire connections; check inverter PCB assembly IPM.

SourceLG AH Series Heat Pump - Service Manualp. 61, 82

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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 CH73 procedure

Where this code is documented

Models covered by the manuals that document this code

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