What F21, F22, F24, F25 (Steam Sensor Failure) Means
F21, F22, F24, and F25 all indicate a Steam Sensor Failure on LG range models with a steam-assist cooking or cleaning function, per LG's range Help Library article, which gives all four the identical description and fix. Note this is an entirely different F21 than the Whirlpool washer F21 code some competitor and other-brand sites document - on an LG range, F21 has nothing to do with laundry or a coin trap; it's specific to LG's oven steam sensor.
Common Causes of F21, F22, F24, F25 (Steam Sensor Failure)
- Steam sensor has failed or lost contact
- Sensor wiring fault
- Water reservoir or steam delivery system issue affecting the sensor reading
🔧 One Safe Check You Can Try
Turn the circuit breaker for the range off, wait 30 seconds, and turn it back on; unlike many of the other oven F-codes, LG doesn't list a CLEAR/OFF button press as a first step for this steam-sensor group.
⚠ Why You Shouldn't Go Further Than That
- If a breaker cycle doesn't clear the code, the steam sensor is inside the oven's steam-delivery system and needs a technician to access and replace.
- Avoid using steam-assist cooking or cleaning functions until this is repaired, since a faulty steam sensor means the oven can't reliably confirm safe steam levels during that function.
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.