Written by
Lena Hartwell Appliance Care EditorPublished October 27, 2026
VERIFIED
Error codeU21 / L21
ApplianceWall Oven
When U21 or L21 is raised
This is the clean over temperature error. On the display it reads OVER TEMP, with U21 for the upper or single oven and L21 for the lower one. The trigger is the center of the cell climbing above 890°F while a self-clean runs.
What still works
Normal cooking can be used, but a self-clean cannot. The door is locked as the cycle starts, and it opens only once the cavity has fallen under 375°F.
What the manual tells the owner
Call for service.
Fault source and checks
The manual blames relays that have stuck and keep the elements energized. A technician is directed to confirm three things: what the probes read, what the cycling and timing charts show, and whether the stored calibration values suit the installed software version.
Which ovens
Dacor Renaissance EOR/MOR ovens and the 27 and 30 inch wall ovens in the Dacor Wall Oven Service Manual.
Dacor self-clean wall oven repair in San Francisco
When a self-clean cycle ends in U21 or L21, call (415) 687-5926 for Dacor wall oven repair in San Francisco and the Bay Area. Say that it happened during self-clean and have the model number ready.
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
U21 (upper/single) or L21 (lower) means the cavity center exceeded 890 F during self-clean.
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.
You submit a request with your appliance model and symptom, we confirm an appointment window, and a technician performs an on-site diagnosis. You then receive a clear estimate and decide whether to proceed before any repair begins.
Yes. We provide an upfront estimate after diagnosis. No parts are ordered or installed until you approve the work, so there are no surprise charges.
Replacement parts are selected for the exact model and confirmed with you before ordering or installation.
Service areas are listed on the Locations page. Contact us with your ZIP code to confirm current coverage for your address.
Ready to get your Dacor appliance working again?
Book a repair online or call us — clear estimates and approval before any repair work begins.
