Safety first: Turn off power at the breaker. Electronic boards can store charge; avoid touching components unnecessarily.

Visual inspection: Remove the toe-kick and access panel to reach the main control board (often in a sealed housing on the right or bottom). Inspect for burned spots, melted connectors, or a burnt smell.
Check power supply: Verify that the dishwasher is receiving correct voltage at the terminal block. Loose connections can mimic control failure.
Inspect harness connections: Ensure all plugs on the control board are fully seated and free of corrosion.
Rule out peripheral faults: Confirm that major loads (heater, pumps) are not shorted, as they can damage a new board. Test for shorts to ground before replacing the control.
Replace control board: If the board is visibly damaged or all other components test good, install a new Viking main control module, transferring any jumpers or programming plugs as specified.

E12 error with inconsistent cycle times, random stopping, or no operation.

Possible Causes