Error code reference

LG Air Conditioner Error Code 12

Misconnection of connecting cables between indoor and outdoor units, or connecting pipe/cable issue causing refrigerant pressure problems.

SourceLG Multi Type Room Air Conditioner - Service Manual: LM-1601A2F Seriesp. 27

LG codes LG air conditioner codes

Diagnostic procedure

The full 12 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 for misconnection of connecting cables, check connecting pipe and connecting cable. To operate again, pull out power cord and re-insert.

SourceLG Multi Type Room Air Conditioner - Service Manual: LM-1601A2F Seriesp. 27

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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

13 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 12 procedure

Where this code is documented

Models covered by the manuals that document this code

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