Dacor Oven Error Code U25

U25 means the ambient temperature probe in the upper or single oven cavity has shorted, causing the relay board's analog-to-digital converter to register a value of 0x10 or lower. This value falls outside the valid range for normal probe signals and tells the oven's control system that the temperature sensor data cannot be trusted. The oven will display this code to alert the user and prevent inaccurate or unsafe operation.

It is not recommended to use the oven while U25 is active. The ambient temperature probe provides the control system with critical data for regulating heat output. A shorted probe means the oven is operating without reliable temperature feedback, which could result in the oven running hotter than the selected setting without triggering a safety response. Have the probe and relay board inspected before resuming use.

Repair costs depend on which component has failed. If only a wiring harness connector needs cleaning or reseating, the cost may be limited to a service call fee, typically in the range of $75 to $150. Replacing the ambient temperature probe or the upper relay board adds parts costs that can bring the total to $200 to $500 or more depending on part pricing and labor rates in your area. Getting a diagnostic quote from a qualified technician before authorizing repairs is advisable.

You can clear the U25 error and attempt to run a basic cooking mode to check whether the fault was intermittent. If the code returns immediately or during operation, the oven should not be used until the underlying problem is repaired, because a shorted ambient probe means the control system cannot accurately monitor oven temperature. Continuing to cook without a functioning temperature probe creates a risk of overheating.

Start by clearing the error code and running the oven in a basic cooking mode to see if the fault returns. If U25 comes back, inspect the wiring harness between the ambient temperature probe and the upper relay board for shorts, heat damage, or loose connectors. If the wiring checks out, the next step is replacing the upper relay board, which is the primary repair action indicated for this fault code. In some cases the ambient probe itself has shorted internally and also requires replacement.