GE Oven Error Code F23

F23 means the control board has detected that the resistance on the lower oven sensor circuit has exceeded the acceptable threshold. The lower oven sensor is a temperature probe inside the oven cavity, and this code tells you the ERC can no longer get a valid reading from it. The fault is in the circuit running through connector CN300 pins 1 to 8 or Machine Control lower oven board connector J300 pins 1 to 2.

No, you should not use the oven while F23 is active. Because the control board cannot reliably read the lower oven temperature, the oven has no accurate way to regulate heat in the lower cavity. This creates a risk of overheating or erratic temperature behavior. Disconnect power to the oven until the fault is diagnosed and repaired.

Yes. The F23 code reflects a resistance threshold fault in the sensor circuit, not just the sensor component itself. A loose pin, corroded terminal, or damaged wire at connector CN300 or J300 can add enough resistance to the circuit to trigger F23 even if the sensor itself is functional. Always inspect and reseat the connectors at both the sensor end and the control board end before ordering a replacement sensor.

Start by checking the resistance of the lower oven sensor circuit at ERC connector CN300 pin 1 to 8 on the W to W/R wires, or at Machine Control lower oven board connector J300 pins 1 to 2. A room-temperature sensor should read approximately 1080 ohms. If resistance is well above that, replace the lower oven sensor. If resistance is correct at the sensor but abnormal at the connector, inspect the wiring harness and connectors for damage, corrosion, or loose pins. If wiring and sensor both check out, the control board may need replacement.

If the lower oven sensor is the cause, replacement sensors typically run between $20 and $60 for the part, and the repair is manageable for a confident DIYer since it usually involves removing two screws and a wire connector. A wiring harness repair is similar in cost but more labor-intensive to access. If the ERC or Machine Control lower oven board has failed, control boards can range from $150 to $350 or more depending on the model, and professional installation labor will add to that cost.