Dacor Range, Oven, Cooktop Error Code F31

F31 on a Dacor Discovery Range indicates a shorted RTD temperature sensor or shorted sensor wiring. The RTD sensor measures oven cavity temperature by varying its electrical resistance, and a short circuit causes the control board to read an abnormally low resistance value. The oven triggers this fault code to prevent unsafe or uncontrolled heating. Both the sensor itself and the wiring connecting it to the control board are potential sources of the short.

Operating the oven while F31 is active is not recommended. A shorted temperature sensor means the control board cannot accurately monitor the oven cavity temperature, which could result in overheating or unpredictable heating behavior. It is best to discontinue use until the sensor or wiring has been repaired or replaced.

Repair costs vary depending on whether the fault is in the sensor or the wiring. An RTD temperature sensor replacement part typically costs in the range of $30 to $100 depending on the specific model, while professional labor for diagnosis and replacement can add $100 to $250 or more. If only the wiring needs repair rather than full replacement, the cost may be lower. Getting a diagnostic estimate from a qualified technician before committing to the repair is advisable.

A knowledgeable DIYer can attempt to diagnose and repair the F31 code by testing the RTD sensor resistance with a multimeter and visually inspecting the sensor wiring for damage. If the sensor tests shorted, replacing it is a straightforward repair involving disconnecting the old sensor and installing a new one. If the wiring harness is damaged, repairing or replacing the affected wiring section is also possible but requires care to ensure proper insulation in a high-heat environment.

Resetting the oven by cycling the power may temporarily clear the F31 display, but the code will return if the underlying short in the sensor or wiring has not been corrected. A reset does not repair the sensor or wiring fault. The code will reappear as soon as the control board attempts to read temperature data and detects the short again.