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Error code reference

Dacor Range Oven Cooktop Error Code C25

Heritage: Control board ambient temp sensor shorted

Dacor codesDacor range oven cooktop codes

Heritage: Control board ambient temp sensor shorted - shorted thermistor detected.

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What C25 means on a Dacor range oven cooktop

Error code C25 on Dacor Heritage series ranges and ovens indicates that the control board's ambient temperature sensor has been detected in a shorted condition. The ambient thermistor is a resistive temperature sensing component mounted near or on the control board assembly. Its primary function is to monitor the temperature of the control electronics themselves, protecting the board from thermal damage during high-heat cooking cycles. When the control board's internal diagnostics detect a resistance value from this thermistor that falls below the expected range for a shorted circuit, it triggers the C25 fault and halts normal operation.

A shorted thermistor means the sensor's resistance has collapsed to near zero ohms rather than displaying the typical negative temperature coefficient (NTC) resistance curve that changes predictably with temperature. This is distinct from an open circuit failure, where resistance goes infinite. Shorting can occur due to physical damage to the sensor wiring, moisture or grease contamination bridging the thermistor leads, a failed thermistor component itself, or damage to the control board's thermistor input circuit.

Because the ambient sensor protects the control electronics from overheating, the appliance will typically lock out cooking functions while this fault is active. Diagnosis requires inspecting the thermistor wiring harness for pinched or melted insulation, measuring thermistor resistance directly at the component, and evaluating whether the fault originates in the sensor itself or in the control board's input circuitry.

Source: manufacturer service documentation.

Common causes of C25

  1. 01

    Failed ambient thermistor

    Part replacement

    The thermistor itself has internally short-circuited, causing its resistance to drop to near zero. This is the most common root cause and can be confirmed by measuring resistance directly across the thermistor terminals.

  2. 02

    Shorted or damaged thermistor wiring harness

    Part replacement

    The wiring between the thermistor and the control board may have melted insulation, pinched conductors, or leads touching each other, creating a short circuit before the signal reaches the board. Inspect the harness routing for any contact with hot surfaces.

  3. 03

    Moisture or grease contamination

    Wiring / connection

    Liquid or grease intrusion onto the thermistor leads or connector pins can bridge the circuit and simulate a short. Inspect the connector for corrosion, residue buildup, or moisture and clean or replace as needed.

  4. 04

    Damaged control board thermistor input circuit

    Part replacement

    If the thermistor and its wiring test correctly but the fault persists, the input circuit on the control board itself may be damaged. This would require control board replacement.

See the test procedure for each cause

Frequently asked questions about C25

What does C25 mean on a Dacor range, oven, cooktop?
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.
Can I fix the C25 error on my Dacor oven myself?
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.
Is it safe to use my Dacor oven while the C25 error is active?
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.
How much does it cost to repair a Dacor C25 error?
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.
Will resetting my Dacor oven clear the C25 error code?
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.

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