LG Refrigerator Error Code Er gF — Flow Sensor Error (Water Dispenser)
What this means
The Er gF error code indicates the LG refrigerator's water dispenser flow sensor is detecting a problem. This sensor monitors water flow through the dispenser. The error can be triggered by low water pressure, a frozen water supply line, a failed flow sensor, or a clogged water filter that is restricting flow.
Alternate codes: gF
Step-by-step fix
4 stepsCheck the water filter
If the water filter has not been replaced in over 6 months, it may be clogged and restricting flow. Replace it with a new LG water filter. After installing the new filter, flush 2–3 gallons of water through the dispenser.
Always use genuine LG or NSF-certified replacement filters. Third-party filters sometimes restrict flow.
Check for a frozen water line
If the refrigerator temperature is set too low, the water supply line inside the door can freeze. Set the freezer to 0°F and the fridge to 37°F. If you suspect a frozen line, unplug the refrigerator for 2 hours or use a hair dryer to warm the water line in the door.
On French door models, the water line runs through the left door — gently warm the bottom of the door to thaw it.
Verify household water pressure
Test the water dispenser. If flow is very slow from all faucets in the house, the issue is household water pressure. LG refrigerators require a minimum of 20 PSI water pressure for proper dispenser operation.
Test the flow sensor
If filter and water supply are fine, the flow sensor itself may be faulty. It is typically located in the water line near the dispenser assembly inside the door. Access it by removing the door panel and test for proper operation.
When to call a professional
If the flow sensor or water inlet valve behind the refrigerator needs replacement, a technician can handle the plumbing and electrical connections.
Information compiled from manufacturer service manuals, official troubleshooting documentation, and appliance repair industry resources. This guide is for informational purposes only — always consult a qualified technician for complex repairs.
Learn more about our sourcesParts you may need
LG Water Filter (LT1000P)
Part #ADQ747935 · $30–$50
Replace every 6 months for proper flow
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