Error code reference

LG Air Conditioner Error Code 73

PFC fault error (software) - AC input instant over current, inverter PCB input power current is over 48A peak for 2ms.

SourceLG Air Conditioner - Service Manual: Multi-Inverter Typep. 40, 107

Diagnostic procedure

The full 73 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 pipe clogging/distortion, check covering, check EEV connector, check refrigerant pressure, check input voltage (230V ±15%), check compressor wire connections.

SourceLG Air Conditioner - Service Manual: Multi-Inverter Typep. 40, 107

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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

6 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 73 procedure

Where this code is documented

Models covered by the manuals that document this code

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