Written by
Lena Hartwell Appliance Care EditorPublished October 27, 2026
VERIFIED
Error codeU24 / L24
ApplianceWall Oven
What the display is reporting
U24 shows up on an upper or single Dacor wall oven, and L24 on the lower oven of a double. Each one announces that the ambient temperature probe is open. That probe is a thermistor on the relay board, and the screen reads OVER TEMP.
Oven behavior while it is active
The oven loses every function as soon as the open probe is detected. The manual gives owners a single instruction: call for service.
Repair sequence in the manual
Clear the error.
Run a basic cooking mode as a test.
Replace the upper relay board.
The manual describes the thermistor as stuck open.
Ovens covered
The code comes from the service manual for 27-inch and 30-inch Dacor wall ovens, single or double, with touch-glass control. The extract does not name a series.
Codes on the same thermistor
U25 / L25: the same ambient probe, shorted instead of open
For a Dacor wall oven in San Francisco or elsewhere around the Bay Area that is dead with U24 or L24, phone (415) 687-5926. Have the code, the model number and a note that the oven offers no functions at hand. Background on the work is under Dacor wall oven repair.
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
The ambient temperature probe, a thermistor on the relay board, reads open.
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.
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Replacement parts are selected for the exact model and confirmed with you before ordering or installation.
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Book a repair online or call us — clear estimates and approval before any repair work begins.
