Dacor Oven Error Code C42

The C42 error code on a Dacor oven indicates an E2 checksum failure on the electronic control board. This means the control board calculated a checksum value from its EEPROM memory that does not agree with the checksum value previously stored in that memory. The fault points to corrupted or unreadable data in the control board's internal EEPROM chip.

Operating the oven with a C42 fault is not recommended. Because the error indicates corrupted control board memory, the oven's settings, temperature calibration, and safety logic may not function reliably. It is best to avoid using the appliance until the control board has been inspected and the fault resolved.

Repair costs depend primarily on the price of the replacement control board and labor rates in your area. Control board replacements on Dacor ovens typically range from roughly $300 to $700 or more for parts and labor combined, depending on the specific model and local service rates. Getting a diagnostic estimate from a certified technician before committing to the repair is advisable.

A power reset may temporarily clear the C42 code if the EEPROM corruption was caused by a transient event such as a brief power interruption. To reset, turn off the circuit breaker supplying the oven for several minutes, then restore power. If the error returns after the reset, the EEPROM chip or control board has likely sustained permanent damage and will need to be replaced.

Start by performing a power reset at the circuit breaker to rule out a transient memory error. If the code returns, the electronic control board will need to be replaced, as the EEPROM chip is soldered directly to the board and cannot be serviced separately in the field. A qualified appliance technician can confirm the diagnosis and source the correct replacement board.