Error code reference

Samsung Washer Error Code AC4

Communication check error between the LCD Module and main PBAs due to communication failure, incorrect or loose connections, or faulty soldering.

SourceSamsung Top-Loading Washer - Service Manual (WA52J8700 Series)p. 20

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 the connector connections between the LCD Module and main PBAs for incorrect or loose connections.

SourceSamsung Top-Loading Washer - Service Manual (WA52J8700 Series)p. 20

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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