What F31 Means
F31 on an older Bosch Evolution range is the shorted counterpart of the open-sensor code: the control module reads near-zero resistance across the oven temperature sensor circuit. The manual's procedure separates a shorted probe from a shorted harness by unplugging the sensor and measuring it on its own, with a good part still reading in the 1080 to 1110 ohm band.
Common Causes of F31
- Sensor probe internally shorted
- Sensor harness shorted between the probe and the control module
- Chafed wiring contacting the range chassis
🔧 One Safe Check You Can Try
No home measurement applies here. What is worth recording is whether the oven has been running hot or refusing to heat at all, since a shorted sensor reads as an impossibly high temperature to the control.
⚠ Why You Shouldn't Go Further Than That
- A shorted sensor circuit can also present as the stuck keypad code on this platform, so the display alone does not identify the fault.
- Measuring at two points, the module and the sensor, is what separates a bad probe from a bad harness, and one of those is behind the cavity.
- The range has to come forward to reach either point, and on a gas or dual fuel model the appliance gas valve must be shut first.
- Chafed wiring that shorts intermittently reads perfectly on a cold bench, which is how good harnesses get thrown away.
Opening a panel to inspect or repair something yourself doesn't automatically cancel your manufacturer's warranty — but it can risk accidental damage, and some manufacturers do have specific service conditions. Check your product's warranty terms, or ask us, before deciding.