Error code reference

LG Air Conditioner Error Code 55

Transmission error from central controller to main PCB in outdoor unit: main PCB cannot receive signal from central controller for 3 minutes.

SourceLG Air Conditioner - Service Manual: Heat Pump CRUN/CRNN Seriesp. 213, 236

LG codes LG air conditioner codes

Diagnostic procedure

The full 55 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

Verify if central controller PCB is normal and group setting has been carried out.

SourceLG Air Conditioner - Service Manual: Heat Pump CRUN/CRNN Seriesp. 213, 236

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Where this code is documented

2 manuals in the MyPros+ library document this code for LG air conditioner.

Models covered by the manuals that document this code

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The full 55 procedure

Where this code is documented

Models covered by the manuals that document this code

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