Viking Range Error Code Cycle 3 flashes / Clean ON

The Cycle 3 flashes / Clean ON error on Viking 30", 36", and 48" RH oven models indicates an A/D (Analog-to-Digital) Stuck condition originating in the self-cleaning oven control board. The A/D converter is a critical component within the control board that continuously samples analog sensor signals, such as temperature inputs from the oven's RTD or thermocouple probe, and converts them into digital values the control processor can interpret. When this converter becomes stuck, it stops cycling through its conversion process and locks on a fixed value, preventing the control board from receiving accurate real-time data.

This fault is specific to the self-cleaning oven control board architecture used across the RH series in the three listed sizes. The stuck A/D condition typically points to a failure internal to the control board itself, as the converter circuitry, reference voltage components, or the microprocessor interface responsible for initiating and reading A/D conversions has malfunctioned. In some cases, an unstable power supply to the board or a shorted sensor circuit connected to the A/D input can force the converter into a locked state.

Because the A/D converter feeds critical temperature data to the control logic, a stuck condition will prevent the oven from operating safely or accurately, particularly during a self-clean cycle where precise high-temperature management is essential. Technicians should inspect the temperature sensor circuit for shorts or out-of-range resistance before condemning the control board, as an abnormal load on the A/D input can produce this fault without the board itself being defective.