ErrorCodeDoctor
LG Range (Gas) F1 error code
The F1 error means your LG range detected a problem with the upper oven thermistor — the temperature sensor that monitors heat levels inside the upper oven cavity during cooking. Without an accurate temperature reading the oven cannot regulate heat safely and stops the function. A reset clears it in some cases but if F1 keeps returning the thermistor will need to be inspected and replaced by a technician.
Common causes
- Upper oven thermistor has malfunctioned or failed
- Wiring connection to the upper oven thermistor is loose or damaged
- Temporary electronic glitch causing a false thermistor reading
How to fix it
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1
Press the CLEAR/OFF key to clear the error and try the original function again
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2
If F1 reappears turn off the circuit breaker for the range and wait 30 seconds
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3
Turn the circuit breaker back on and check if the error has cleared
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4
If F1 persists after resetting the upper oven thermistor needs inspection and replacement by a qualified technician
Related LG Range (Gas) error codes
F1 error — frequently asked questions
What does the F1 error mean on a LG range (gas)?
The upper oven thermistor detected a fault
What causes the F1 error?
The F1 error is usually caused by: Upper oven thermistor has malfunctioned or failed; Wiring connection to the upper oven thermistor is loose or damaged; Temporary electronic glitch causing a false thermistor reading.
Can I fix the F1 error myself?
This is rated a hard fix — it often requires tools, parts, or experience, and may be safer left to a professional technician.
How much does it cost to fix the F1 error?
Fixing the F1 error on a LG range (gas) typically costs $80–$200, depending on parts and whether you do it yourself or hire a technician.
Is it safe to keep using my range (gas) with the F1 error?
We'd recommend addressing the F1 error before continuing to use the range (gas), since hard-rated issues often involve a real fault rather than a minor glitch.