GE Range Error Code F21x

The F21x code on a GE range means the control board has detected a temperature inside the oven cavity exceeding 900 degrees Fahrenheit while the door is unlocked. This is a safety fault that halts oven operation. It typically points to a welded relay on the control board that is keeping the heating element on continuously, or to a high-resistance connection at the temperature sensor wiring near the rear of the oven.

Resetting the range by cutting power at the breaker may temporarily clear the displayed fault, but it will not resolve the underlying problem. If the cause is a welded relay contact, the element will continue to receive uncontrolled power once the oven is restarted and the fault will return. A proper diagnosis of the relay contacts and sensor connectors is required before the range can be safely used again.

Repair costs vary depending on the failed component. A replacement oven temperature sensor typically runs in the range of $20 to $60 for the part. A control board replacement is more expensive, generally in the range of $150 to $350 or more for the part alone. Adding professional labor costs can bring the total repair anywhere from $150 to $500 or higher, depending on your location and the specific component that needs to be replaced.

No, you should not use the oven while this fault is active. The F21x code indicates a potential runaway heating condition, which poses a fire risk and could cause serious damage to the oven interior. Disconnect power to the range and do not operate it until the underlying cause, whether a welded relay or a faulty sensor circuit, has been identified and corrected.

Start by inspecting the relay contacts on the control board for signs of welding or fusing in the closed position. Next, check the wiring harness connector at the temperature sensor near the rear of the oven for corrosion, high resistance, or loose pins. If the connector and wiring check out, test the RTD temperature sensor itself for correct resistance values. Depending on what is found, the repair will involve replacing the control board, the sensor, or repairing the wiring connection.