Dacor Range Oven Cooktop Error Code U80

The U80 error code on a Dacor range or oven indicates a fault in the meat probe circuit for the upper or single oven cavity. The meat probe system uses a temperature-sensitive resistor (thermistor) built into the probe tip that changes resistance as the internal food temperature rises. The oven control board monitors this resistance continuously and converts it to a temperature reading displayed on the panel. When the board detects a resistance value that falls outside the expected range, either too low (indicating a short circuit) or infinite/absent (indicating an open circuit), it triggers the U80 fault and halts probe-based cooking.

A shorted probe condition occurs when internal wiring within the probe or its cable makes unintended contact, driving the resistance reading abnormally low and causing the control to interpret an incorrect temperature. An open circuit condition occurs when a wire is broken or the thermistor element inside the probe has failed, resulting in no continuity through the probe circuit. Both conditions make accurate food temperature monitoring impossible, which is why the control board stops operation and displays the fault.

Diagnosing U80 starts with inspecting the probe itself and its connection to the oven socket. The probe cable should be checked for kinks, burns, or pinch damage. The probe socket inside the oven cavity should be inspected for corrosion or debris. Using a multimeter, technicians can measure resistance across the probe plug pins: a good probe reads within a predictable thermistor range at room temperature, while a shorted probe reads near zero ohms and a failed probe reads OL (open). If the probe checks out, the wiring harness from the socket to the control board should be tested for continuity and shorts to ground.