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Error code reference
LG Air Conditioner Error Code 59
Slave outdoor unit mixed installation: old sub outdoor unit and new slave outdoor unit installed together.
SourceLG Air Conditioner - Service Manual: Outdoor Unit R410A (ARUN/ARUV)p. 116
Diagnostic procedure
The full 59 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
Verify if 3 or more units are installed and check if both LGDC slave and super sub units are present.
SourceLG Air Conditioner - Service Manual: Outdoor Unit R410A (ARUN/ARUV)p. 116
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
3 manuals in the MyPros+ library document this code for LG air conditioner.
Models covered by the manuals that document this code
75,000+ service documents · 20,000+ error codes · 100+ brands
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