Written by
Elena Navarro Appliance Repair Content SpecialistPublished September 11, 2026Updated October 20, 2026
Error codeC42
ApplianceWall Oven
Quick answer
C42 is an E2 checksum failure on the control board of Epicure and Millennia wall ovens.
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
E2 checksum failure on control board.
Seeing C42 on a Dacor Renaissance wall oven means the control board ran an E2 checksum and the calculated value does not agree with the stored E2 checksum.
Covered ovens
Older-series ovens only: EORS/EORD Epicure and MORS/MORD Millennia, models 127, 130, 227 and 230.
What to do
The guide describes the failure but gives no steps for the owner. Because it concerns data held on the control board, the repair side belongs to a technician. Switch the oven off at the breaker if it behaves oddly.
Nearby codes
C44 is the matching failure for the FLASH checksum.
C41 is the A/D reference check on oven temperature readings.
C74 is the logic board E2 checksum failure on other Dacor ovens.
Dacor oven service for Los Angeles homes
Call (310) 742-1907 about a C42 and have the model number to hand. Our Dacor wall oven service page covers what we work on; also say what the oven did when the code came up.
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.
