LG Refrigerator gF Error
gF also appears in LG's Er guide (as Er gF) — but LG's analog list gives this code its own specific water-supply procedure, and that procedure, not the generic Er reset, is what this page prints.
What to check first
- Read the code exactly: gF / Er gF (segment form 9F) = water flow sensor error.
- Reset LG's way: unplug, wait 60 seconds, reconnect directly to a socket; allow up to 5 minutes for full restart.
- Check the supply before the sensor: tap fully open, hose unkinked, pressure within the manual's range.
- gF persists after supply checks → the sensor itself: request service.
A gF code (also listed as Er gF) is a water flow sensor malfunction: LG's analog list defines it as an error in the sensor that measures the amount of water flowing for the filtered-water dispenser or the ice maker. But read LG's cause list before condemning the sensor — the list is mostly plumbing: the code occurs when the water supply tap is closed, the water hose is kinked, preventing water flow, or the water pressure is incorrect. A sensor that truthfully reports no flow looks exactly like a failed sensor, and LG's procedure tests the supply before the sensor.
Safety first
- This code's territory is where water meets electricity. LG's procedure starts unplugged and works on the supply line — follow that order, and if water is leaking in quantity at any point, that is the stop condition below, not a troubleshooting step.
- Stop condition: stop using the machine and unplug it — and do not run it again until it has been checked — if you smell burning, see smoke, find damaged electrics (a scorched plug, a melted or cut cable), or water is leaking in quantity.
Common causes
The water supply tap is closed (or partly closed)
LG's first listed cause. A tap closed for plumbing work and not fully reopened starves the sensor of the flow it exists to measure.
The water hose is kinked
LG's second cause: a kinked supply hose preventing water flow — classically after the refrigerator has been pushed back against the wall.
Incorrect water pressure
LG's third cause. The required pressure range for your model is in its manual; a recently changed filter, a new installation, or work on the house supply can all move the pressure the sensor sees.
The flow sensor itself has malfunctioned
The code's headline meaning — and the cause that remains when the supply checks out. Sensor replacement is service work.
Step-by-step checks
- Reset the LG way: 60 seconds, direct socketUnplug the refrigerator from the power outlet and reconnect it after 60 seconds, ensuring it is connected directly to a socket (LG's instruction for this procedure).
- Let the refrigerator fully restart — up to 5 minutesAfter reconnecting, wait for the error code to clear; it may take up to 5 minutes for the refrigerator system to restart completely (LG's timing).
- Check the water supply tap is fully openLG's check: confirm the tap feeding the refrigerator is completely open, not partially.
- Straighten the water hoseInspect the supply hose for kinks — especially behind the refrigerator — and straighten it to ensure a smooth flow of water.
- Check the water pressure is adequateLG's check: verify the pressure is sufficient for the appliance; the correct range for your specific model is in its manual.
- If gF persists after the supply checksThe remaining cause on LG's own list is the sensor itself. Request service — and tell LG which supply checks were completed.
When to call a technician
gF is mostly a plumbing diagnosis wearing a sensor's name — LG's procedure is written that way, and this page follows it. If the tap, hose and pressure all check out and gF persists, the flow sensor itself is the diagnosis, and it is a service replacement.
Model differences
| What you have | What changes |
|---|---|
| Segment displays | gF can render as 9F — LG's list illustrates the code with a 9F display photograph. |
| Er gF | Also listed in LG's Er guide. Where the two LG documents differ in approach, this page follows the analog list, because it publishes the code-specific procedure. |
One-page checklist — gF
- Code read exactly (gF / Er gF / 9F)
- Reset done LG's way: unplug 60 seconds, direct socket, up to 5 minutes to restart
- Tap confirmed fully open
- Hose checked and straightened
- Pressure checked against the model manual's range
- gF persists → flow sensor: LG service requested
Official LG references
Frequently asked questions
Is the sensor really broken?
Not necessarily — that is the point of LG's cause list. A closed tap, a kinked hose or wrong pressure makes a healthy sensor report a flow error. LG's procedure checks the supply first; the sensor is the conclusion only after the supply passes.
Why does the reset specify a direct socket?
LG's procedure for this code states it: reconnect directly to a socket after 60 seconds unplugged. The same instruction appears in LG's FU procedure. This page prints LG's instruction as given.
The code cleared but the dispenser is still slow. Related?
Possibly — the sensor measures flow for the dispenser and ice maker, and LG's causes (tap, kink, pressure) all reduce flow before they ever trigger a code. Re-run the supply checks; they are the same list.