Dacor Range Oven Cooktop Error Code C24

Error code C24 on Dacor Heritage series ranges and ovens indicates that the control board has detected an open circuit condition in the ambient temperature thermistor. This thermistor is a resistive temperature-sensing component mounted near or on the main control board itself, and its purpose is to monitor the temperature of the electronics compartment. When the control board reads an open thermistor, it means the resistance value from the sensor has exceeded the expected range to the point where continuity is effectively lost, preventing any valid temperature reading from being returned.

An open thermistor condition is distinct from a shorted thermistor. With an open fault, the circuit is broken rather than collapsed to a low-resistance state. This can occur because the thermistor element itself has failed internally, because the wiring harness connecting the thermistor to the control board has developed a break or disconnection, or because a connector has corroded or pulled loose. In some cases, physical damage to the thermistor from excessive heat exposure in the electronics cavity can cause this type of failure.

Because the ambient sensor feeds temperature data directly to the control board, the board cannot properly regulate or protect itself without this input. The C24 code will typically lock out normal operation until the fault is resolved. Diagnosing this code requires checking the thermistor resistance with a multimeter, inspecting the wiring harness for continuity, and confirming all connectors between the sensor and board are fully seated and undamaged.