Dacor Range, Oven, Cooktop Error Code C73

C73 is a communication error indicating that the main control board and the relay board are unable to exchange data properly. This typically points to a software compatibility issue or an incorrect relay board ID setting. The appliance will not function normally until the communication link is restored. Wiring harness problems or a failed board can also trigger this code.

A power reset by disconnecting the appliance from its power source for several minutes may temporarily clear the code, but if the underlying cause is a software mismatch or relay board ID misconfiguration, the error will return. A reset alone is unlikely to resolve the problem permanently. The root cause must be identified and corrected to prevent the fault from reoccurring.

Repair costs vary depending on the root cause. If the issue is only a relay board ID misconfiguration or software compatibility correction, labor costs from a qualified technician are the primary expense, typically in the range of $100 to $200. If a relay board replacement is needed, parts can range from $150 to $400 or more depending on the model. Main control board replacement is generally the most expensive repair, often ranging from $250 to $600 or higher when combined with labor.

Start by verifying that the relay board ID settings match the software version installed on the main control board. Next, inspect the communication wiring harness and connectors between the two boards for damage, corrosion, or loose pins. If the settings and wiring check out, the relay board or main control board may need to be replaced. This repair often benefits from a trained technician, especially if software configuration is involved.

It is not recommended to continue using the appliance while the C73 error is active. A communication failure between the main control board and relay board means the appliance cannot reliably control its heating elements or other high-voltage components. Operating it in this condition could lead to unpredictable behavior or unsafe operation. The fault should be diagnosed and resolved before resuming normal use.