Dacor Oven Error Code U55

U55 on a Dacor oven means the upper or single oven latch motor has failed to receive adequate power, or the motor output circuit is shorted to 5 volts. The latch motor controls the door lock used during self-clean cycles. The control detects this condition by monitoring the power output at connector J17 pins 2 and 4 on the relay board. The oven will not allow self-clean operation while this fault is active.

Normal baking and broiling functions may still operate depending on when and how the fault is triggered, but you should avoid running any self-clean cycle while U55 is active. The self-clean cycle relies on the door latch motor to lock the door at high temperatures, and a non-functional latch motor means the door lock safety interlock cannot be confirmed. Running self-clean under these conditions is a safety risk and could cause the oven to reach extreme temperatures with an unlocked door.

Repair costs depend on which component has failed. A replacement latch motor mechanism typically costs in the range of $50 to $150 for the part alone. A relay board replacement is generally more expensive, often in the $100 to $300 range for the part. Adding professional labor, total repair costs can range from $150 to $500 or more depending on your location and the specific model. Getting a diagnosis first, whether by a technician or by testing the J17 connector yourself, will help avoid replacing the wrong component.

Some basic checks, such as inspecting connector J17 for loose or corroded pins and examining the wiring harness for visible damage, can be done by a knowledgeable DIYer. However, properly diagnosing whether the relay board or the latch motor assembly is at fault requires a multimeter and the ability to measure voltage at the J17 connector while the control commands the latch. Replacing either the relay board or the latch motor is within reach for experienced DIYers, but working around oven wiring carries electrical risk, so professional service is the safer option if you are not comfortable with these procedures.

A power reset by turning off the circuit breaker for 60 seconds may temporarily clear the code, but it will return as soon as the control attempts to actuate the latch motor again if the underlying fault is not repaired. The U55 code is tied to a hardware failure in the latch motor circuit, so a reset alone does not fix the problem. Repair or replacement of the faulty component is required for a lasting resolution.