ErrorCodeDoctor
LG · Range (Gas)
LG Range (Gas) F21 error code
Difficulty: Hard
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Cost: $80–$250
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Duration: 5m
The F21 error means your LG range detected a failure in the steam sensor — the component that monitors steam levels inside the oven cavity, typically used during steam-assisted cooking functions. When it fails the range cannot manage steam cooking safely and stops the function. A circuit breaker reset clears it in some cases but if F21 keeps returning the steam sensor will need to be inspected and replaced by a technician.
Common causes
- Steam sensor has malfunctioned or failed completely
- Wiring connection to the steam sensor is loose or damaged
- Internal fault in the steam sensor circuit
How to fix it
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1
Turn off the circuit breaker for the range and wait 30 seconds
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2
Turn the circuit breaker back on and check if the error has cleared
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3
If F21 persists after resetting the steam sensor needs inspection and replacement by a qualified technician