Written by
Elena Navarro Appliance Repair Content SpecialistPublished September 11, 2026Updated October 20, 2026
Error codeU24 / L24
ApplianceWall Oven
Quick answer
U24 and L24 report an open ambient temperature probe (relay board thermistor) on Dacor wall ovens. The oven offers no functions until serviced.
Model compatibility: Dacor reuses codes across series and model years, so U24 / L24 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) open.
Seeing U24 (upper or single oven) or L24 (lower oven) on a Dacor wall oven tells you the ambient temperature probe reads open. That probe is a thermistor mounted on the relay board, and the display shows OVER TEMP.
What you can use
Nothing. Once the open probe is detected no functions are available, and the owner’s instruction in the manual is simply to call for service.
Behind the code
The manual blames a thermistor that is stuck open. Its fix is to clear the error, test with a basic cooking mode, and replace the upper relay board.
Models
Dacor wall ovens of 27 and 30 inches, single or double, from the Dacor Wall Oven Service Manual.
Related codes
U25 is the shorted version of the same ambient probe fault. U23 is the ambient over temperature shutdown.
Dacor wall oven service in Los Angeles
When a Dacor wall oven in Los Angeles shows U24 or L24, call (310) 742-1907. Give the code and the model number and say that the oven offers no functions. Find wall oven repair information here.
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.
