Bosch Range Error Code F31

F31 means the control board has detected an open circuit in the oven temperature sensor circuit while a cook or clean cycle was running. The sensor is responsible for continuously reporting oven temperature, and when the signal is lost for more than 20 seconds, the oven locks out heating and displays F31. This is a safety response to prevent uncontrolled oven temperatures.

Surface burners on a gas or dual-fuel range may still operate, but the oven should not be used while F31 is active. Because the control board has no reliable temperature data, it cannot regulate oven heat properly, creating a risk of overheating. Avoid using the oven until the sensor or wiring fault is resolved.

If only the oven temperature sensor needs replacement, parts typically range from around 20 to 80 dollars depending on the specific model, with additional labor costs if a technician performs the repair. Wiring harness repairs or connector replacements are generally on the lower end of the cost range. A control board replacement, if required, is significantly more expensive and can range from 150 to 400 dollars or more for parts alone.

You can clear the code by powering the range off at the circuit breaker for about 30 seconds and then restoring power. However, if the underlying open circuit condition still exists in the sensor or wiring, the fault will return within 20 seconds of starting a cook or clean cycle. A reset alone is not a repair and should only be used as part of diagnosing whether the fault is intermittent.

Start by inspecting the sensor wiring harness for any disconnected connectors, visible wire damage, or burned insulation, as these are the easiest and lowest-cost issues to address. If the wiring is intact, test the sensor itself with a multimeter for continuity and resistance. An open reading on the sensor means it needs to be replaced. If both the sensor and wiring are good, the control board may need evaluation by a qualified technician.