LG Oven Error Code F-2

The F-2 error code means the upper oven thermistor has been detected in a shorted state for more than one minute after a cook cycle starts. The thermistor is the temperature sensor inside the oven cavity that tells the control board how hot the oven is. When this sensor shorts out, the board cannot accurately read oven temperature and shuts down cooking to protect the appliance. The fault points to the thermistor, its wiring harness, or the connector at CN04 pins 3 and 4 on the control board.

No, you should not attempt to use the oven while F-2 is active. The error means the control board cannot reliably monitor upper oven temperature, which creates a risk of uncontrolled overheating. The oven is designed to halt operation when this fault is present, and bypassing or ignoring it could be a safety hazard.

If the thermistor itself is the problem, parts and labor typically range from around $100 to $250 depending on your location and service provider. If the wiring harness needs repair or replacement, costs may fall in a similar range. A control board replacement, which is the least likely cause, can range from $200 to $400 or more including labor.

A knowledgeable DIYer can diagnose F-2 using a multimeter to check resistance at CN04 pins 3 and 4, where a normal reading is approximately 1.09 kΩ at room temperature. If the thermistor reads near 0 Ω or well outside the normal range, replacing the sensor is a manageable repair for someone comfortable working with oven components. However, if the wiring harness or control board is involved, repairs become more complex and may warrant professional service.

Cycling power to the oven may temporarily clear the F-2 code, but the error will return once a cook cycle starts if the underlying thermistor fault is still present. The code is triggered after the shorted condition persists for over one minute during cooking, so the root cause must be repaired to permanently resolve it. A reset should only be used as part of the diagnostic process, not as a fix.