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Error code reference
LG Air Conditioner Error Code 172
Outdoor voltage sensing error of sub3: abnormal resistance value of sensor measurement.
SourceLG Air Conditioner - Full Service Manual: LRNU/LRUN/LRUV Series (R22)p. 212
Diagnostic procedure
The full 172 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
1
First diagnostic step
Refer to CH49 procedure.
SourceLG Air Conditioner - Service Manual: ARUB Series (R410A)p. 258, 300
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
10 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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