Written by
Elena Navarro Appliance Repair Content SpecialistPublished September 11, 2026Updated October 20, 2026
Error codeC73
ApplianceWall Oven
Quick answer
C73 means the logic board found the wrong number or arrangement of power boards in the oven.
Model compatibility: Dacor reuses codes across series and model years, so C73 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: only one power board detected on a double oven (or none on a single), or two upper/two lower boards on one logic board.
A Dacor wall oven showing C73 COMM ERROR has a problem with how its boards are detected. The manual gives two possible failures: only one power board is detected on a double oven, or no power boards on a single oven; or two upper or two lower boards are connected to one logic board.
Applies to
Dacor 27-inch and 30-inch single and double wall ovens with touch-glass control. The series name is not stated.
How the oven behaves
The logic board has to detect this condition in the first 5 seconds after power comes back. No oven functions are available while it is present, and the manual calls the error reversible.
Owner response
Call for service. The checks in the manual, wiring, board ID switch settings and software compatibility before any board is replaced, are technician work.
Related codes
C72 when the logic board loses contact with the relay boards.
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.
