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Error code reference
LG Washer Error Code AC4
Communication check between the WIFI Module and main PBA due to signals not being sensed, incorrect or loose connections, or faulty soldering.
SourceLG WA52M8650AV Washer - Service Manualp. 19
Diagnostic procedure
The full AC4 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
Check connector connections between the WIFI Module and main PBA.
SourceLG WA52M8650AV Washer - Service Manualp. 19
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
5 manuals in the MyPros+ library document this code for LG washer.
Models covered by the manuals that document this code
75,000+ service documents · 20,000+ error codes · 100+ brands
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