Dacor Range, Oven, Cooktop Error Code U20

The U20 code means the oven detected a cook temperature exceeding 610 degrees Fahrenheit sustained for two or more minutes in the upper or single oven cavity. This is a safety-triggered shutdown to protect the appliance and surrounding structure. The oven will stop heating until the fault is cleared and the underlying cause is corrected.

Disconnecting power to the oven for a few minutes may clear the code temporarily and allow the oven to restart, but if the underlying component failure is still present, U20 will return once the oven reaches operating temperature again. A reset is useful for confirming whether the fault is intermittent, but it is not a repair.

Repair costs vary depending on which component has failed. A replacement temperature sensor typically ranges from around $30 to $80 for the part, while a relay board or control board can range from $150 to $400 or more depending on the model. Adding professional labor, total repair costs generally fall between $200 and $600, though complex control board replacements on higher-end models can exceed that range.

No, you should not attempt to continue cooking while U20 is active. The code indicates the oven reached a dangerously high temperature and shut down as a protective measure. Operating it again before diagnosing the root cause risks damaging the oven cavity, surrounding cabinetry, and could create a fire hazard.

Start by testing the oven temperature sensor for correct resistance and inspecting its wiring harness for damage. If the sensor checks out, examine the relay board for signs of burnt or welded relay contacts. Depending on the failed component, you will likely need to replace the temperature sensor, relay board, or control board, all of which require disassembly of the oven.