Viking Dishwasher Error Code 5-2

Error code 5-2 on a Viking dishwasher (450 model only) indicates a blower current sense error. This fault is exclusive to the service cycle and means the main control board has detected that the blower motor's current draw is outside the acceptable operating range. The blower is responsible for circulating air during the drying phase, and the control board continuously monitors the current flowing through the blower circuit to confirm proper operation. When that current reading falls too high or too low relative to expected parameters, the 5-2 fault is triggered.

The most immediate diagnostic step is to inspect the wiring harness running between the main control board and the blower motor. Loose connectors, broken wires, or terminals that have backed out of their housings can interrupt the current sense signal entirely, which the control interprets as an out-of-range condition. Corrosion at connector pins is another common culprit, particularly in a dishwasher environment where humidity is consistently high.

If the wiring checks out, the fault likely points to either the blower motor itself or the main control board. A failed blower motor may draw excessive current due to a seized bearing or shorted winding, or draw insufficient current if the winding is open. Because this code only appears during the service cycle, technicians must initiate that specific diagnostic mode to confirm and reproduce the fault before condemning any individual component.