GE Oven Error Code F31

F31 means the control board has detected that the upper oven sensor circuit resistance is outside the expected range. The board monitors the sensor circuit through specific connector pins and will display F31 when the reading does not match normal operating thresholds. The fault points to the upper oven temperature sensor, the wiring connecting it to the board, or in rare cases the board itself.

Operating the upper oven with an active F31 code is not recommended. The control board uses the sensor signal to regulate temperature, and if that circuit is faulty, the oven cannot accurately control heat. This creates a risk of overheating or failure to heat properly. Discontinue use of the upper oven until the sensor circuit has been tested and the fault resolved.

Yes. A loose, corroded, or heat-damaged connection at connector CN300 or J300 can cause F31 even when the sensor itself is perfectly functional. Before replacing the sensor, reseat the connector at the control board and inspect the W to W/BK wires for any visible damage. Measuring resistance directly at the connector pins will confirm whether the fault is in the sensor, the wiring, or the connection point.

Start by disconnecting power to the oven and measuring resistance across the sensor circuit at connector CN300 pins 1 to 3 (W to W/BK) on the ERC, or J300 pins 1 to 2 on the Machine Control board. A healthy sensor reads around 1080 ohms at room temperature. If the reading is open, shorted, or far outside that range, replace the upper oven temperature sensor. If the connector and wiring check out but the reading is still wrong, inspect the harness for damage. If everything in the circuit measures correctly, the control board may need replacement.

If the upper oven temperature sensor is the cause, sensor replacement parts typically range from $20 to $50, and replacement is a manageable DIY repair requiring a screwdriver and a multimeter. If the wiring harness needs repair or replacement, add $20 to $80 for parts. A control board replacement is the most expensive scenario, with boards ranging from $150 to $350 or more depending on the model. Professional labor typically adds $100 to $200 on top of parts.