KitchenAid Oven Error Code F31

F31 means the control board has detected that the lower oven temperature sensor circuit is either open or shorted. The sensor should read approximately 1075 ohms at 68°F, and a reading outside acceptable limits triggers this code. The fault can originate from the sensor probe itself, the wiring harness, or the connector at pins P3-1 and P3-2. The oven will not operate reliably until the underlying cause is resolved.

It is not recommended to use the oven while F31 is active. Because the lower oven temperature sensor is not providing a reliable reading, the control board cannot properly regulate heat in the lower cavity. This could result in overheating, underheating, or unpredictable behavior during cooking cycles.

Resetting the oven by cutting power at the breaker for a few minutes may temporarily clear the F31 code, but it will return if the underlying sensor or wiring fault is still present. A reset is useful for confirming whether the fault is intermittent, but it does not fix the root cause. Permanent resolution requires diagnosing and repairing the sensor circuit.

A knowledgeable DIYer can diagnose and often fix F31 by testing the sensor resistance with a multimeter and inspecting the wiring and connector at P3. If the sensor reads far outside 1075 ohms at room temperature, replacing it is a straightforward repair involving removing the probe from the oven cavity and reconnecting the harness. However, if the wiring is damaged deep within the oven structure or the control board needs replacement, professional service may be more practical.

If only the temperature sensor needs replacement, parts typically range from $20 to $60 depending on the model, and the repair is manageable without professional help. If a professional technician is needed, total repair costs including labor generally range from $100 to $250. Control board replacement, if required, can push costs higher, often in the $200 to $400 range for parts and labor combined.