Dacor Range, Oven, Cooktop Error Code C25

C25 on a Dacor Heritage appliance means the control board's ambient temperature sensor has been detected in a shorted condition. This thermistor monitors the temperature of the control electronics to protect them from heat damage. When the control system reads a resistance value consistent with a short circuit from this sensor, it triggers the C25 code and disables normal cooking functions.

It is not recommended to attempt to override or continue using the oven with C25 active. The ambient thermistor protects the control board from overheating, and operating without a functioning sensor removes that protection. Continued use risks permanent damage to the control board electronics.

Resetting the appliance by cycling the power may temporarily clear the C25 code, but if the underlying short circuit in the thermistor or wiring still exists, the fault will return when the control board runs its diagnostics again. A reset is useful for confirming whether the fault is intermittent, but it does not fix the root cause and should not be treated as a permanent solution.

A knowledgeable DIYer with electrical diagnostic skills can inspect the thermistor wiring harness for visible damage, check connector pins for contamination, and use a multimeter to measure thermistor resistance. If the thermistor itself has failed, replacing it is a straightforward parts swap. However, if the control board's input circuit is damaged, board replacement is more complex and may warrant a professional technician.

Repair costs vary depending on the root cause. A replacement ambient thermistor is typically the least expensive fix, with parts costs generally ranging from $20 to $80. If the control board requires replacement, parts alone can range from $150 to $400 or more, with professional labor adding to the total cost.