Dacor Range, Oven, Cooktop Error Code L42

The L42 code indicates a failure has been detected on the relay board for the lower oven. The relay board controls power switching to the lower oven's heating elements. This fault disables the lower oven to prevent unsafe heating conditions and requires diagnosis and likely repair of the relay board or associated wiring.

You should avoid using the lower oven while L42 is active. A failed relay stuck in the closed position could cause a heating element to remain energized continuously, creating a fire risk or damaging other components. A relay failed open means the oven will not heat correctly, which is a lesser safety concern but still indicates a component that requires service.

Repair costs vary depending on whether the fix requires a new relay board, wiring repairs, or replacement of additional components. Parts costs for relay boards on Dacor ovens typically range from roughly 80 to 250 dollars depending on the model, and professional labor can add another 100 to 200 dollars or more. Getting a diagnosis from a technician before ordering parts is recommended to confirm the failed component.

Cycling power to the appliance by turning off the circuit breaker for 60 seconds and restoring it may temporarily clear the code, but if the relay board has a physical failure, the code will return as soon as the lower oven is used again. A reset does not repair the underlying fault. If the code does not return after a reset, monitor the oven closely for signs of abnormal heating behavior.

Fixing L42 typically requires inspecting and testing the lower oven relay board for failed relays, burned components, or damaged solder joints. The wiring harness connected to the relay board should also be checked for shorts or loose terminals. In most cases, the relay board will need to be replaced. This repair involves working near high-voltage components and is best performed by a qualified appliance technician.