Error code reference

LG Air Conditioner Error Code 173

Failure of main constant speed compressor operation - comp locking, check valve leakage, or compressor dielectric breakdown.

SourceLG Air Conditioner - Service Manual: LRNU/LRUN/LRUV Series (R22)p. 170, 239

LG codes LG air conditioner codes

Diagnostic procedure

The full 173 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 compressor runs when pressing magnetic switch; check check valve direction; measure insulation resistance (about 20MΩ).

SourceLG Air Conditioner - Service Manual: LRNU/LRUN/LRUV Series (R22)p. 170, 239

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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

20 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 173 procedure

Where this code is documented

Models covered by the manuals that document this code

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