Dacor Range, Oven, Cooktop Error Code U43

U43 indicates a fault detected at the S19 relay position on the relay board for the upper or single oven. The code means the control system has identified either a bad connection at that relay or a failure of the relay board itself. This board controls power switching to the oven's heating elements, so the fault can affect heating performance or create a safety concern if the relay is stuck closed.

Using the oven with an active U43 code is not recommended. A failed relay that is stuck in the closed position can leave a heating element energized when it should be off, creating a burn or fire hazard. It is best to leave the oven off until the relay board and its connections have been inspected and repaired.

If only a connector needs reseating, the repair cost may be limited to a service call fee, typically in the range of $75 to $150. If the relay board requires replacement, parts and labor combined can range from $200 to $450 or more depending on the specific model and local labor rates.

A knowledgeable DIYer can start by disconnecting power, accessing the relay board, and reseating the wiring harness connectors at the S19 relay position. If connections look clean and secure but the error returns, replacing the relay board is the next step and involves working near high-voltage components. If you are not comfortable with appliance electrical work, a qualified technician should handle the repair.

Cycling power to the oven by shutting off the circuit breaker for a few minutes may temporarily clear the code, but if the underlying problem with the S19 relay connection or the relay board persists, the code will return. A reset alone does not correct a hardware fault.