Dacor Oven Error Code C35

The C35 error code on a Dacor oven indicates that the relay board has detected a shorted ambient temperature thermistor. The ambient temperature probe is a thermistor, meaning its resistance changes predictably with temperature, and the relay board continuously monitors this resistance to track the internal cabinet or electronics bay temperature. When the thermistor shorts internally, its resistance drops to near zero ohms, which falls outside the expected operating range. The relay board interprets this abnormal resistance reading as a fault condition and triggers the C35 code to alert the technician that the ambient probe circuit has failed in a shorted state.

The relay board itself is the control component responsible for switching high-voltage loads such as heating elements and fans, and it also processes sensor inputs including the ambient thermistor. A shorted thermistor can result from heat damage to the probe or its wiring harness, moisture intrusion into the connector, physical damage to the sensor body, or a manufacturing defect in the thermistor element itself. The wiring between the relay board and the probe is also a potential failure point, as insulation breakdown can create a short to ground or a short within the harness.

Diagnosis should focus on measuring the resistance of the ambient thermistor at the relay board connector and directly at the probe terminals. A shorted thermistor will read near zero ohms rather than the expected resistance value for the ambient temperature. If resistance reads correctly at the probe but not at the board connector, the fault is in the wiring harness. If the probe itself reads shorted, the thermistor requires replacement. In some cases, the relay board's internal sensing circuit can fail and falsely report a short even when the probe is functional.