What gF (Flow Sensor / Low Water Pressure) Means
gF flags a flow sensor error or low water pressure to the ice maker/water dispenser, per LG's error-code list and its combined troubleshooting article. LG notes an overfilling ice maker can point to the same flow sensor malfunctioning.
Common Causes of gF (Flow Sensor / Low Water Pressure)
- Water supply valve partially closed
- Low household water pressure
- Kinked or pinched water supply line
- Flow sensor itself has failed
🔧 One Safe Check You Can Try
Check that the water line's shutoff valve behind or under the refrigerator is fully open, and confirm your home's water pressure is adequate; if pressure is genuinely low, that's a plumbing issue more than an appliance fault, but if pressure is fine and gF persists, that points to the flow sensor itself.
⚠ Why You Shouldn't Go Further Than That
- If your water pressure checks out fine elsewhere in the house and gF still won't clear, the flow sensor is inside the water valve assembly at the back of the unit - not a part most owners have replaced before, and getting it wrong risks a water leak.
- An ice maker that's actually overfilling because of this fault can spill water inside the freezer, so don't ignore repeated gF codes hoping they'll resolve on their own.
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.