ErrorCodeDoctor
LG Range (Electric) F4 error code
The F4 error means your LG range detected a problem with the lower oven thermistor — the temperature sensor that monitors heat levels inside the lower oven cavity during cooking. Without an accurate temperature reading the lower oven cannot regulate heat safely and stops the function. A reset clears it in some cases but if F4 keeps returning the thermistor will need to be inspected and replaced by a technician.
Common causes
- Lower oven thermistor has malfunctioned or failed
- Wiring connection to the lower 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 F4 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 F4 persists after resetting the lower oven thermistor needs inspection and replacement by a qualified technician
Related LG Range (Electric) error codes
F4 error — frequently asked questions
What does the F4 error mean on a LG range (electric)?
The lower oven thermistor detected a fault
What causes the F4 error?
The F4 error is usually caused by: Lower oven thermistor has malfunctioned or failed; Wiring connection to the lower oven thermistor is loose or damaged; Temporary electronic glitch causing a false thermistor reading.
Can I fix the F4 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 F4 error?
Fixing the F4 error on a LG range (electric) 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 (electric) with the F4 error?
We'd recommend addressing the F4 error before continuing to use the range (electric), since hard-rated issues often involve a real fault rather than a minor glitch.