Bosch Oven Error Code F31 — Oven Temperature Sensor Open Circuit
What this means
Error F31 means the oven temperature sensor's electrical circuit is open, meaning the sensor wire has broken or the sensor element has failed. Without a functioning sensor, the oven cannot monitor or control its internal temperature and will shut down as a safety measure.
Step-by-step fix
4 stepsTest the sensor
Disconnect the sensor and test with a multimeter. It should read approximately 1,080 ohms at room temperature. An open circuit (infinite reading) confirms failure.
Check wiring
Inspect the wires running from the sensor to the control board. A broken wire can cause an open circuit reading even if the sensor is fine.
Wires can break where they flex or pass through the oven cavity wall.
Replace the sensor
If the sensor reads open, replace it. The sensor probe mounts with one or two screws inside the oven.
Route the new sensor wire carefully to avoid contact with heating elements.
Verify the repair
After installation, run the oven at 350°F and confirm it heats and holds temperature correctly.
When to call a professional
If the wiring is damaged inside the oven wall, professional repair may be needed to safely route new wiring.
Information compiled from manufacturer service manuals, official troubleshooting documentation, and appliance repair industry resources. This guide is for informational purposes only — always consult a qualified technician for complex repairs.
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