Written by
Lena Hartwell Appliance Care EditorPublished October 27, 2026
VERIFIED
Error codeC72
ApplianceWall Oven
Symptom
Look for C72 on the display, which the manual files as a TWI communication error. It is raised after at least six seconds in which the logic board and the relay boards exchange nothing.
The sequence, step by step
Both boards persist. The logic board hunts for the relay board while the relay board repeats its reset commands.
Once a full minute has passed the manual treats it as fatal: the power board keeps resetting the logic board, and the cooling fan is switched to high speed.
None of the oven’s functions can be used in the meantime.
As soon as contact comes back, the oven reboots and works again, which is why the error is described as reversible.
Ovens it concerns
The Dacor Wall Oven Service Manual applies this to touch-glass single and double ovens, 27-inch and 30-inch. It gives no series name.
Advice for the owner
Code displayed but cooking works: ring service to log it, and the oven stays in use.
Repeated restarts: ring service.
Looking over the links between relay and logic boards, along with the relay board switch settings, is left to a technician.
Our Dacor wall oven repair page covers San Francisco and the Bay Area, and (415) 687-5926 is the number to dial. Tell us that C72 appeared and give the model number, along with whether the oven kept cooking or kept resetting.
Model compatibility: Dacor reuses codes across series and model years, so C72 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
No communication between the logic board and the relay boards for at least six seconds.
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.
