Dacor Range, Oven, Cooktop Error Code C42

C42 on a Dacor Heritage appliance indicates an E2 checksum failure on the main control board. The board calculates a checksum from its EEPROM memory contents and compares it to the stored checksum value. When those two values do not agree, the board triggers C42, signaling that its internal memory data is corrupted or unverifiable.

A C42 fault means the control board cannot verify the integrity of its stored configuration and calibration data. Using the appliance in this state is not recommended, as the board may not operate with accurate settings. It is best to avoid using the oven until the fault is diagnosed and resolved.

If a single power interruption caused the error, a power reset is worth attempting first and requires no technical skill. If the error persists, the repair involves replacing the main control board, which requires comfort working with appliance electronics and safely disconnecting power. Many experienced DIYers can handle a control board swap, but if you are uncertain, a qualified appliance technician is the safer choice.

A power reset may temporarily clear the C42 error if the corruption was caused by a one-time event such as a brief power interruption. However, if the EEPROM chip itself has failed or the data corruption is persistent, the error will return after the reset. A recurring C42 after multiple resets indicates the control board needs to be replaced.

Because C42 almost always requires replacing the main control board, repair costs typically fall in the range of $200 to $600 or more, depending on the specific Heritage model and whether you use a professional technician or perform the replacement yourself. Labor costs vary by region and service provider.