Dacor Range Oven Cooktop Error Code L55

The L55 error code on a Dacor range or oven signals a fault in the lower oven door latch system. This system is critical during self-clean cycles, where the latch motor drives a mechanical lock that secures the oven door at high temperatures. When the control board sends a signal to engage or disengage the latch and does not receive the expected feedback, it logs the L55 fault to prevent the appliance from operating in an unsafe or undefined state.

The two primary failure points identified for this code are the latch motor itself and the relay board. The latch motor is a small electric motor assembly positioned at the top of the oven door frame. It drives a locking bar across the door when a self-clean cycle is initiated. If the motor winding has failed, if the motor is mechanically jammed, or if the motor is not receiving proper voltage, the latch will not complete its travel and the fault is triggered. The relay board controls power delivery to the latch motor, and a failed relay on this board can prevent the motor from receiving its activation signal entirely.

Diagnosing L55 requires checking both the mechanical and electrical sides of the latch system. A technician should inspect the latch motor for signs of burning or physical obstruction, verify continuity through the motor windings, and confirm that the relay board is supplying the correct voltage to the motor circuit when commanded. If voltage is present at the motor terminals but the motor does not respond, the motor assembly is the likely replacement target. If voltage is absent at the motor, the relay board should be tested and replaced if a failed relay is confirmed.