F31Bosch Oven — Bosch Oven F31 Error Code

The F31 code means the oven's NTC temperature sensor (PT1000 probe) has failed or is producing a reading outside the control board's valid range. The probe extends into the oven cavity and continuously reports the internal temperature. A broken wire, corroded connector, or failed sensing element will trigger F31. The oven cannot regulate its heating elements without a valid temperature signal, so it will refuse to heat until the fault is resolved. F31 is one of the most searched Bosch oven codes.

Locate the temperature probe inside the oven cavity — it is typically a thin metal rod protruding from the back wall, secured by one or two screws. Disconnect the probe's wiring connector (usually accessible by removing the back panel or rear trim) and measure resistance with a multimeter. A healthy probe should read approximately 1080 ohms at room temperature. If the reading is open (OL) or shorted (near zero), replace the probe (part 00487468). Also inspect the connector for corrosion and clean or replace it if necessary.