Viking Range Error Code A/D Stuck LED (Cycle light 3 flashes then 4s OFF, Clean light ON)

The A/D Stuck LED error on a Viking self-clean range indicates that the analog-to-digital converter within the oven control board has become stuck or is failing to cycle through its conversion process correctly. The A/D converter is a critical component on the control board responsible for translating analog input signals, such as temperature readings from the oven sensor, into digital values the control board processor can interpret. When this conversion process halts or produces an out-of-range result, the board flags the fault. The specific indicator pattern is the Cycle light flashing three times followed by a four-second off period, while the Clean light remains continuously illuminated.

This error is directly tied to the self-clean oven control board, not the standard bake or broil circuitry. The fault can originate from a corrupted or degraded A/D converter on the board itself, but it can also be triggered by faulty input signals feeding into that converter. The most common input signal for temperature conversion comes from the oven temperature sensor probe. If the sensor is shorted, open, or drifting outside its normal resistance range, it can cause the A/D converter to receive an invalid signal and become stuck in an error state.

Because the error is tied to the control board's internal processing, external factors such as voltage fluctuations or wiring faults between the sensor and the board can also contribute. Diagnosing this fault typically involves checking the oven temperature sensor for correct resistance, inspecting the wiring harness between the sensor and the control board for damaged or loose connections, and then evaluating the control board itself if the sensor and wiring check out correctly.