Dacor Oven Error Code L54

The L54 error code on a Dacor oven indicates a lower latch and door lock enable failure. Specifically, the lock enable output is active when the oven temperature is below 440°F, or it fails to become active when the temperature rises above 650°F. This is a self-clean cycle safety system fault: the door lock mechanism should only engage when temperatures reach the self-clean range, and it must reliably lock at high temperatures to prevent the door from being opened during potentially dangerous operating conditions.

The relay board is the central component responsible for sending the enable signal to the door lock actuator. When this board malfunctions, it can send erroneous lock signals at low temperatures or fail to send the required lock signal at high temperatures. Either condition triggers the L54 code, as both represent a failure of the lock enable output to behave correctly relative to the oven's thermal state.

The most likely cause is a failed or faulty relay board, which is why the primary diagnostic step is direct replacement of that component. However, wiring issues between the relay board and the door lock assembly, as well as a defective door lock actuator itself, can produce similar symptoms. A thorough diagnosis should confirm whether the relay board output signal is present and correct before condemning other components in the circuit.