Dacor Oven Error Code C73

C73 on a Dacor oven signals a communication error caused by an incorrect board configuration. The system has detected a problem such as only one power board on a double oven, two upper or two lower relay boards connected at the same time, or board ID switches set to the wrong state. It is a control system configuration fault that typically appears after installation or a board replacement.

A power reset may temporarily clear the display, but the C73 code will return if the underlying configuration problem is not corrected. The fault is tied to how the boards are wired and identified, so it will reappear on the next communication cycle until the switch settings, wiring, or faulty board are properly addressed.

If the fix is simply correcting board ID switch settings or reseating a loose connector, there may be little to no parts cost, though a service call fee will apply if a technician is involved. If a relay board needs replacement, total repair costs including parts and labor typically range from around $200 to $500 or more depending on the specific board and local labor rates. Replacing the logic board, if needed as a last resort, will generally be on the higher end of that range.

If you are comfortable working with appliance control boards and wiring harnesses, you can start by checking the communication line connections and verifying the board ID switch settings, which requires no parts. However, if the issue involves a missing, mismatched, or failed relay board, a technician will be better equipped to safely identify and replace the correct component.

A C73 error indicates the control system cannot properly identify or communicate with the relay boards, which means the oven may not operate correctly or reliably. It is best to avoid using the oven until the configuration fault is resolved, as the system may not respond to commands as expected.