Dacor Range, Oven, Cooktop Error Code U51

U51 means the control board did not detect closure of the phase switch in the door latch assembly on the upper or single oven. This switch confirms that the latch has fully engaged, which is required before operations like a self-clean cycle can proceed. The error indicates a problem with the latch assembly, its wiring, or the control board. The oven will not continue the affected operation until the fault is resolved.

The U51 error specifically affects the door latch interlock system, which is a safety circuit. Normal baking and broiling functions may still operate, but you should not attempt to run a self-clean cycle until the latch issue is resolved, as the door latch prevents the oven from reaching and holding self-clean temperatures safely. Investigate and resolve the error before using the self-clean function.

Repair costs depend on the failed component. A latch assembly replacement typically ranges from around $80 to $200 or more for the part alone, with additional labor costs if a technician performs the work. Control board replacement is generally more expensive, with parts alone potentially ranging from $150 to $400 or higher depending on the specific model. Getting a diagnostic estimate from a technician before authorizing repairs is recommended.

Some causes of U51 are within reach of a careful DIYer, such as clearing debris from the latch mechanism, checking for a misaligned door, or inspecting wiring connectors for obvious damage. However, replacing the latch assembly or control board involves working with high-voltage components and requires disconnecting power to the appliance before beginning. If you are not comfortable working with appliance wiring, a qualified technician should perform the repair.

Power cycling the oven by shutting off the circuit breaker for a few minutes may temporarily clear the error display, but the code will return if the underlying latch or wiring fault has not been corrected. A reset does not repair the phase switch, latch assembly, or wiring. Address the root cause before relying on the oven for normal operation.