Error code reference

Samsung Washer Error Code AC3

Communication error between Inverter PBA and main PBA - signals not sensed due to communication error, incorrect/loose connections, or faulty soldering.

SourceSamsung WF45M5500/WF45M5100 Washer - Service Manualp. 22

Diagnostic procedure

The full AC3 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 Inverter PBA and main PBA; check for incorrect or loose connections.

SourceSamsung WF45M5500/WF45M5100 Washer - Service Manualp. 22

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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