Written by
Lena Hartwell Appliance Care EditorPublished October 27, 2026
VERIFIED
Error codeU31 / L31
ApplianceWall Oven
The short story on U31 and L31
Probe 1 is an RTD, and these codes say it is shorted: U31 on the upper or single oven, L31 on the lower. The display shows TEMP SENSOR. A fatal error is logged after 60 seconds of continuous readings past the minimum bounds.
Using the oven meanwhile
Probe 2 acts as the primary probe. Baking and roasting go on, but calibration may shift a little and cleaning is off the table. Results can come out a bit hotter or cooler than usual, and the manual still recommends calling for service.
Manual checklist
Connections at the relay board come first.
Then the probe state at the probe connector.
If needed: secure the connection, swap the probe, swap the harness.
Suspects named: loose connections at the board, a faulty probe, a faulty wire in the harness.
Applies to
Dacor Renaissance EOR and MOR wall ovens and the 27-inch and 30-inch ovens in the Dacor service manual.
Phone (415) 687-5926 from anywhere in the Bay Area with a shorted probe 1. A note on odd cooking results, the U31 or L31 code and the model number make the call quicker. You can also read about Dacor wall oven repair.
Model compatibility: Dacor reuses codes across series and model years, so U31 / L31 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
Temperature probe 1 (an RTD) reads shorted.
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.
