Dacor Range, Oven, Cooktop Error Code L31

L31 indicates a shorted RTD condition in the lower oven temperature sensor circuit. The control board has detected a resistance reading that falls below the acceptable range, meaning it cannot accurately monitor the lower oven temperature. The fault points to either a short in the sensor wiring, a failed RTD sensor, or a connection issue at one of the harness junction points.

No, it is not safe to operate the oven while L31 is active. Because the sensor circuit is shorted, the control board cannot reliably read the lower oven temperature, which means it cannot regulate heat correctly. Continued use could result in overheating or unpredictable oven behavior. The oven should remain off until the fault is diagnosed and repaired.

Repair costs depend on what component is at fault. Replacing an RTD temperature sensor typically ranges from around $50 to $150 for the part, plus labor if a technician is involved. A wiring harness repair or replacement can vary widely based on extent of damage. Control board replacement, if needed, is generally the most expensive scenario and can run from several hundred dollars upward including parts and labor.

A knowledgeable DIYer can start by visually inspecting all wiring connections in the lower oven sensor circuit for obvious damage, corrosion, or loose terminals, which requires no special tools. Testing the RTD sensor's resistance with a multimeter is also within reach for those comfortable working on appliances with the power disconnected. However, if the wiring harness needs replacement or the control board is involved, professional service is recommended.

A power reset, such as switching off the circuit breaker for a minute and restoring power, may temporarily clear the L31 code, but it will return if the underlying short circuit condition in the sensor or wiring has not been corrected. The fault needs to be physically resolved before the code will stay cleared.