Written by
Lena Hartwell Appliance Care EditorPublished October 27, 2026
VERIFIED
Error codeC42
ApplianceWall Oven
Reading C42
The checksum that the control board works out for its E2 memory does not equal the E2 checksum kept in storage. Dacor lists this as an E2 checksum failure on the control board.
Ovens that show it
Renaissance Epicure: EORS and EORD
Renaissance Millennia: MORS and MORD
Variants 127, 130, 227 and 230
All of these belong to an older Dacor wall oven series.
Steps for the owner
None are offered in the manual. The control board is what needs checking, and that is a job for a technician. If the oven acts strangely, turn it off at the breaker.
Bay Area owners can reach us on (415) 687-5926 about a C42. Have the model number, the time the code first showed and anything you tried on hand, and read about the work on our Dacor wall oven repair page.
Model compatibility: Dacor reuses codes across series and model years, so C42 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 control board reports an E2 checksum failure.
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.
