Dacor Oven Error Code C25

C25 means the control board has detected a shorted ambient temperature thermistor. This thermistor monitors the temperature inside the control cavity to protect the electronics. A short in this sensor causes its resistance to collapse, sending an invalid signal to the control board and triggering the fault code. The oven may stop operating normally until the fault is resolved.

Resetting the oven by cutting power at the breaker for a few minutes may temporarily clear the code, but it will return as soon as the control board runs its diagnostic check again if the underlying fault is still present. A reset alone is not a fix. The thermistor, wiring, and connectors need to be physically inspected and tested to resolve the fault permanently.

If only the ambient thermistor needs replacement, parts and labor costs are generally modest, typically ranging from around $75 to $200 depending on the specific model and technician rates in your area. If the control board is the faulty component, costs increase significantly, often ranging from $300 to $600 or more including parts and labor. Getting a diagnostic visit from a qualified technician can help pinpoint the exact cause before committing to a repair cost.

A knowledgeable DIYer with a multimeter can diagnose the fault by checking the thermistor's resistance and inspecting the wiring harness for visible damage. Replacing the ambient thermistor is a relatively straightforward repair if the component is accessible. However, if the control board itself is faulty, board replacement is more complex and may be better suited for a qualified technician.

It is not recommended to continue using the oven while a C25 fault is active. The ambient thermistor protects the control board electronics from heat damage, and operating without a functioning sensor removes that protection. Continued use could lead to control board damage or unpredictable oven behavior. The fault should be diagnosed and repaired before resuming normal cooking.