Dacor Oven Error Code C41

The C41 error code on a Dacor oven indicates a failure in the analog-to-digital (A/D) reference readings safety check. This internal verification process is designed to confirm that the RTD (resistance temperature detector) sensor readings being processed by the oven control board are accurate and within expected parameters. The control board continuously monitors A/D reference voltages to validate that temperature conversions are producing reliable data. When the board detects that these reference readings fall outside acceptable limits, it triggers C41 to prevent the oven from operating on potentially incorrect temperature data.

The RTD sensor is a precision resistive component that changes its electrical resistance in a predictable way as oven temperature changes. The control board reads this resistance value and converts it to a temperature reading through its A/D converter circuit. If the A/D reference voltage is unstable, incorrect, or out of calibration, the entire temperature measurement system becomes unreliable. This is a safety-oriented check, meaning the oven is actively protecting against unsafe operation at unintended temperatures.

The most likely causes involve the control board itself, since the A/D reference circuit is integrated into the board's electronics. However, wiring faults between the RTD probe and the control board, a failed or drifting RTD sensor, or poor connections at either end of the sensor circuit can all corrupt the reference readings enough to trigger this fault. A thorough diagnosis should include inspecting the RTD sensor wiring harness, verifying connector integrity, and testing the RTD probe resistance at a known temperature before concluding the control board requires replacement.