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Error code reference
LG Air Conditioner Error Code 171
Input voltage of sub3 outdoor unit exceeds tolerable range (3phase 380V±10% or single phase 220V±10%).
SourceLG Air Conditioner - Service Manual: R410A (ARNU/ARUN/ARUV Series)p. 285
Diagnostic procedure
The full 171 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 CH25 troubleshooting procedure.
SourceLG Air Conditioner - Service Manual: R410A (ARNU/ARUN/ARUV Series)p. 285
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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