Written by
Elena Navarro Appliance Repair Content SpecialistPublished September 11, 2026Updated October 20, 2026
Error codeU20 / L20
ApplianceWall Oven
Quick answer
U20 and L20 are cook over temperature errors on Dacor wall ovens. The cavity center went above 610°F for 2 minutes, and cleaning is blocked until the code is cleared.
Model compatibility: Dacor reuses codes across series and model years, so U20 / L20 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
Cook over temperature: the center of the oven cavity went above 610°F for 2 minutes.
U20 is shown for the upper or single oven and L20 for the lower oven. The display reads U20 OVER TEMP or L20 OVER TEMP, and the code means the center of the oven cell stayed over 610°F for 2 minutes during cooking.
What the oven does next
The door locks and unlocks when the cavity temperature reaches 375°F. Cooking is available again after the temperatures recover. Cleaning is not available until the error code has been cleared, and the manual’s user action is to call for service.
What a technician looks at
The manual lists three sources: software versions that are not compatible, an oven or mode calibration that has shifted, and heating elements that are stuck on. A technician verifies that the software in all the micros is compatible, runs the mode with a thermocouple in the center of the oven cell to see whether readings average within 10°F of target, and runs a cooking mode to watch for the elements cycling after preheat.
Models
The code is documented for Dacor Renaissance EOR and MOR wall ovens and for the 27- and 30-inch ovens in the Dacor Wall Oven Service Manual.
Related over temperature codes
U21 is the clean over temperature error, set during a self-clean. U22 is a temperature amplifier failure between the two probes.
Dacor wall oven service in Los Angeles
When a Dacor wall oven in Los Angeles shows U20 or L20, call (310) 742-1907. Tell us the code, whether it was the upper or lower oven, and the model number. The wall oven repair page has more.
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.
