Written by
Lena Hartwell Appliance Care EditorPublished October 27, 2026
VERIFIED
Error codeU70 / L70
ApplianceWall Oven
The oven has lost contact between its boards. A power board has stopped answering the logic board, and the display shows U70 on the top or only oven or L70 on the bottom one. Nothing on the oven works while the code is displayed.
Source, as listed
Wiring between the logic board and relay board that is loose or wrong
A relay board that has failed
How service proceeds
Check that each cable linking the two boards sits firmly in its socket
Re-seat any that are not
If the fault persists, install a new relay board
The manual simply says to call for service. It covers single and double Dacor wall ovens of 27 and 30 inches with glass touch controls; the series goes unnamed.
Board-related codes
U43 / L43: zero-cross signal missing at the relay board
U55 / L55: latch motor fault with the relay board among the suspects
Model compatibility: Dacor reuses codes across series and model years, so U70 / L70 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
A power board has lost communication with the logic board.
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.
