Viking Dishwasher Error Code User Interface - Machine Control Communication Error

This error means the user interface board and the machine control board have lost the ability to communicate with each other. Both boards need to exchange data continuously for the dishwasher to operate. The fault can stem from a loose harness connection, damaged wiring, or a failure in one of the two boards. The dishwasher will not run normally until communication is restored.

A power reset by disconnecting the dishwasher from power for a few minutes may temporarily clear the error if it was caused by a transient glitch. However, if there is an underlying wiring or board fault, the error will return once the dishwasher attempts to operate again. A reset alone is not a repair and should be followed by a proper inspection of the harness and boards.

If the fix is as simple as reseating a loose harness connector, there may be little to no parts cost, though a service call fee typically applies. If a machine control board or user interface board needs replacement, parts and labor combined can range from roughly $200 to $600 or more depending on the specific boards required and local labor rates. Getting a diagnosis before authorizing parts replacement helps avoid replacing the wrong component.

A knowledgeable DIYer can start by checking whether the wiring harness connecting the two boards is fully seated and undamaged, which requires accessing the interior panels of the dishwasher. If reseating the connectors does not resolve the error, diagnosing and replacing a control board is more involved and typically benefits from professional service. Working with electronic components also carries a risk of further damage if not handled carefully.

The dishwasher is designed to halt operation when this communication error is detected, so it typically will not complete a cycle in this condition. It is not advisable to attempt to force the unit through a cycle when a control communication fault is active, as the machine control board may not be able to properly regulate components like the pump, heating element, or water inlet valve.