Error code reference
Samsung Dishwasher Error Code AC
Communication between main PBA and sub PBA is abnormal; buzzer and drain will not operate in error state but…
Communication between main PBA and sub PBA is abnormal; buzzer and drain will not operate in error state but can recover if communication returns to normal.
First step from the service manual
Check that the communications connection for the main PBA and sub PBA is properly connected; replace main PBA or sub PBA if faulty.
The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.
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- Step-by-step tests with expected resistance, voltage, and continuity values
- Wiring diagram references and connector pinouts from the OEM service manual
- Verified part numbers when replacement is required
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