Dacor Range Oven Cooktop Error Code U32

The U32 error code on a Dacor range or oven indicates an open circuit condition in RTD 2, the second resistance temperature detector assigned to the upper or single oven cavity. RTDs are precision temperature-sensing resistors whose resistance value changes predictably with temperature. An "open" RTD means the control board is reading an infinite or out-of-range resistance value, indicating the circuit is broken somewhere between the sensor and the control board. This prevents the oven from accurately monitoring cavity temperature, which causes the control to fault out rather than risk uncontrolled heating.

The first diagnostic priority is inspecting the wiring at all connection points between RTD 2 and the oven control board. Wiring harness connectors in the oven cavity area are exposed to heat cycling over time, which can cause terminal corrosion, pin backing, or insulation breakdown. A loose or corroded connector will produce an open-circuit reading even if the RTD element itself is intact. Carefully inspect each connector in the sensor circuit, checking for signs of heat damage, corrosion, or terminals that have backed out of their housing.

If the wiring and connectors check out visually and the circuit still reads open, the RTD sensor itself has likely failed internally. The sensor element can fracture or its lead wires can separate from the element body, especially after prolonged high-temperature exposure. Testing the sensor with a multimeter across its terminals will confirm whether it has continuity. A completely open reading across the sensor terminals confirms the RTD needs replacement.