Error code reference

LG Air Conditioner Error Code 43

Master outside unit high pressure sensor fault - sensor open or short.

SourceLG Air Conditioner Outside Unit - Service Manual: ARNU/URNU Seriesp. 109

Diagnostic procedure

The full 43 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 sensor is connected to PCB correctly.

SourceLG Air Conditioner Outside Unit - Service Manual: ARNU/URNU Seriesp. 109

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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

38 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 43 procedure

Where this code is documented

Models covered by the manuals that document this code

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