What F1, F2 (Upper Oven Thermistor Error) Means
F1 and F2 both indicate an Upper Oven Thermistor Error, per LG's range Help Library article - LG documents them as two separate codes with the identical consumer-facing description, which most likely corresponds to two different thermistor positions or readings inside the same upper oven cavity.
Common Causes of F1, F2 (Upper Oven Thermistor Error)
- Upper oven thermistor (temperature sensor) has failed or lost contact
- Wiring connector to the thermistor has come loose
🔧 One Safe Check You Can Try
Press the CLEAR/OFF key and try the original function again; if the code reappears, turn the circuit breaker for the range off, wait 30 seconds, and turn it back on before trying once more.
⚠ Why You Shouldn't Go Further Than That
- If cycling the breaker doesn't clear a repeat F1 or F2, the thermistor is inside the oven cavity wall and needs a technician to access and replace it correctly.
- An oven that can't accurately sense its own temperature can run hotter or cooler than the dial setting without any way for you to tell from outside - don't rely on the upper oven for precise baking until it's repaired.
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.