Dacor Oven Error Code C24

The C24 error code on a Dacor oven indicates that the control board has detected an open circuit condition in the ambient temperature thermistor. This thermistor is a resistive temperature sensor mounted near or on the control board assembly, and its job is to monitor the temperature of the control electronics themselves rather than the oven cavity. The control board continuously reads the resistance value from this probe, and when the circuit reads as open (essentially infinite resistance), the board flags the C24 fault and may limit or shut down oven operation to protect the electronics.

An open thermistor fault means the electrical circuit between the ambient probe and the control board is broken somewhere. This can occur because the thermistor itself has failed internally, because a connector has become loose or corroded, or because the wiring harness between the probe and the board has suffered a break or burn. Unlike a shorted thermistor, an open condition produces no readable resistance signal at all, which is why the board treats it as a definitive fault rather than a range error.

Because this probe monitors control board temperature rather than oven cooking temperature, the fault can appear even when the oven cavity feels and operates normally. Diagnosis should focus on the ambient thermistor component, its connector at the board, and the wire harness routing from the probe back to the control board. In some cases, the control board itself may have a failed input circuit that reads the probe incorrectly, though this is a less common cause than a failed probe or wiring issue.