Dacor Range, Oven, Cooktop Error Code U25

The U25 code on a Dacor range or oven indicates an over-temperature fault caused by a shorted ambient temperature probe on the relay board. This probe monitors the temperature of the control electronics, not the oven cavity. When the probe shorts, it sends an abnormal signal that triggers the fault to protect the oven's electronic components. The oven will typically be non-operational until the issue is resolved.

It is not advisable to operate the oven while the U25 fault is active. The code indicates a failure in the circuit designed to protect the relay board from overheating, so the control electronics may be operating without proper thermal protection. Continued use could risk further damage to the relay board or other electronic components.

Resetting the oven by cycling power at the breaker may temporarily clear the U25 code, but if the ambient temperature probe on the relay board is genuinely shorted, the fault will return once the control system runs its self-diagnostic checks. A power reset is useful for ruling out a one-time control glitch, but a recurring U25 code requires physical inspection and likely component replacement to resolve permanently.

A knowledgeable DIYer can attempt to diagnose U25 by inspecting the wiring harness connected to the relay board's ambient probe and testing the probe for a short using a multimeter. However, if the probe or relay board itself has failed, replacing these components requires disconnecting power, accessing the control cavity, and handling the relay board carefully. If you are not comfortable working with appliance electronics, a qualified technician is recommended.

Repair costs for a U25 fault vary depending on which component has failed. A wiring harness repair or connector cleaning may cost relatively little in parts, while relay board replacement on a Dacor oven can range from roughly $150 to $400 or more for parts alone. Adding professional labor typically brings the total repair estimate to somewhere in the range of $250 to $600, depending on your location and service provider.