Written by
Elena Navarro Appliance Repair Content SpecialistPublished September 11, 2026Updated October 20, 2026
Error codeU25 / L25
ApplianceWall Oven
Quick answer
U25 and L25 report a shorted ambient temperature probe (relay board thermistor) on Dacor wall ovens, with no functions available.
Model compatibility: Dacor reuses codes across series and model years, so U25 / L25 may mean something different on another appliance or generation. Confirm this against your model’s documentation and record your full model number before acting.
Plain language
What this code means
Ambient temperature probe (relay board thermistor) shorted.
The code pair U25 and L25 means the oven found its ambient temperature probe shorted. The probe in question is the relay board thermistor, and the display text is OVER TEMP.
The oven’s response
As soon as a shorted probe is detected the oven offers no functions at all. Owners are told to call for service.
The manual’s explanation
Stuck closed is how the manual describes the thermistor. The remedy listed there is to clear the error, test with a basic cooking mode, then replace the upper relay board.
Applies to
Dacor wall ovens measuring 27 and 30 inches, whether single or double.
Related codes
U24 is the open version of this ambient probe fault. U23 is the ambient over temperature code for the same thermistor, and U22 is about probe amplifiers.
Dacor wall oven service in Los Angeles
Call (310) 742-1907 for Dacor wall oven service in Los Angeles if the oven stays dead with U25 or L25. The code and the model number are what we need first. The wall oven repair page has background.
Important safety warning. Do not attempt repairs involving electrical components, gas, water lines, refrigerant or sealed systems. Unplug the appliance if it is safe to reach the outlet, and leave internal diagnostics to a qualified technician.
Seeing this code on your Dacor appliance?
Book a specialist visit for a clear estimate and approval before any repair.
