Written by
Elena Navarro Appliance Repair Content SpecialistPublished September 11, 2026Updated October 20, 2026
Error codeU70 / L70
ApplianceWall Oven
Quick answer
U70 and L70 report a loss of power board communication with the logic board on Dacor wall ovens.
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
Communication error: loss of power board communication with the logic board.
Seeing U70 on an upper or single Dacor wall oven, or L70 on a lower oven, means the oven has lost contact between its boards. The control logic reports that one or more power boards stopped answering. Coverage: 27-inch and 30-inch single and double ovens with touch-glass control; no series is named in the manual.
Listed causes
The manual blames either a loose or improper link between the logic board and the relay board, or a faulty relay board.
What the technician does
Service staff confirm the communication cable connections are seated solidly, reconnect the cables correctly, and swap the relay board only if that is still necessary. Because nothing on the oven works while the error shows, the manual simply says to call for service.
Codes that appear alongside board faults
U43 / L43 – no zero-cross signal on the relay 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.
