Dacor Range, Oven, Cooktop Error Code L25

L25 indicates an over-temperature fault for the lower oven, caused specifically by a shorted ambient temperature probe on the relay board. The relay board uses this probe to monitor the thermal environment around its own electronics. When the probe shorts, the control reads it as an extreme temperature condition and locks out normal operation to prevent damage.

You should not attempt to bypass or continue using the oven while L25 is active. The fault indicates a failure in a protective temperature monitoring circuit, and operating the appliance without a functioning safety sensor could allow actual overheating to go undetected. Discontinue use until the fault is properly diagnosed and repaired.

Repair costs vary depending on the failed component. If only the ambient temperature probe or its wiring needs replacement, costs are generally lower, typically in the range of $100 to $250 including labor. If the relay board itself has failed and requires replacement, parts alone can range from $150 to $400 or more depending on the specific model, with additional labor on top of that.

A knowledgeable DIYer can attempt diagnosis by locating the relay board, disconnecting the ambient temperature probe connector, and measuring the probe's resistance with a multimeter. If the resistance reads near zero ohms, the probe or its wiring is shorted. However, accessing the relay board requires disassembling the oven's back panel or control area, and working near live components carries risk, so professional service is advisable if you are not comfortable with appliance electrical work.

Power cycling the oven by turning off the circuit breaker for a few minutes may temporarily clear the code, but it will return quickly if the underlying fault, either a shorted probe, damaged wiring, or a failed relay board, has not been corrected. A reset alone is not a repair and should only be used as part of the diagnostic process.