Written by
Elena Navarro Appliance Repair Content SpecialistPublished September 11, 2026Updated October 20, 2026
Error codeU21 / L21
ApplianceWall Oven
Quick answer
U21 and L21 are clean over temperature errors on Dacor wall ovens. Cooking stays available while self-clean is switched off.
Model compatibility: Dacor reuses codes across series and model years, so U21 / L21 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
Clean over temperature: the center of the oven cavity went above 890°F during self-clean.
U21 appears for the upper or single oven and L21 for the lower one, shown as U21 OVER TEMP or L21 OVER TEMP. It is a clean over temperature error: the cell center temperature went over 890°F during self-clean.
How the oven behaves
The door locks when the oven enters self-clean and unlocks once the cavity temperature drops below 375°F. Cooking is available, but self-clean is not. The manual’s action for the owner is to call for service.
What the manual says a technician checks
The manual describes relays that are stuck and keep the elements on. The checks are to verify probe readings, verify the cycling and timing charts, and verify the calibration values against the software version.
Models
Dacor Renaissance EOR and MOR wall ovens and the 27- and 30-inch ovens in the Dacor Wall Oven Service Manual.
Related codes
U20 is the cook over temperature version of this fault, at 610°F. U22 compares the two probe readings.
Dacor wall oven service in Los Angeles
If self-clean on a Dacor wall oven in Los Angeles ends in U21 or L21, call (310) 742-1907. Mention that it happened during self-clean and have the model number ready. Read about wall oven repair too.
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.
