LG Refrigerator ER GF Error: Flow Sensor Error
LG refrigerator error — here’s what you need to know. The Er gF error code on your LG refrigerator indicates a water flow sensor fault — the sensor is not detecting proper water flow to the ice maker or dispenser. This is a Medium severity issue. What Does Er gF Mean on an LG Refrigerator? […]
~60%
DIY Fixable
From $130
Typical Repair Cost
1–2 hours
Pro Repair Time
Quick Assessment
Answer to continue safely
Is it safe to keep using?
Maybe. The refrigerator and freezer cool normally. Only water and ice dispensing are affected. The refrigerator is safe to use but the ice maker and dispenser will not function until the flow sensor issue is resolved.
Can I reset the code?
Yes. A power reset may clear a temporary sensor glitch, but will not fix a clogged sensor, low pressure, or kinked line. Address the root cause before resetting.
When to stop immediately?
Stop if you notice: Water is leaking from the rear supply line connection or inlet valve, The error appeared after moving the refrigerator and the supply line may be damaged.
Symptoms You May Notice
No Water from the Dispenser
Pressing the water dispenser lever produces no water or only a slow trickle. The dispenser solenoid activates (you can hear a click) but no water flows, indicating a supply or sensor blockage upstream of the dispenser.
Ice Maker Stops Producing Ice
The ice maker runs its cycle but produces no ice because it cannot fill the tray with water. The ice maker may click and attempt to cycle repeatedly without result, as the water fill step never completes.
Ice Cubes Are Very Small or Hollow
When the error is intermittent, the ice maker fills with less water than required, producing undersized or hollow cubes. This is an early sign of a flow sensor or supply pressure problem before the error code appears consistently.
Inconsistent temperature performance
The refrigerator runs too hot, too cold, or cycles erratically because the control board receives inaccurate temperature readings from the faulty sensor.
Possible Causes
Frozen or Kinked Water Supply Line
The plastic or copper water line supplying the refrigerator may be kinked behind the unit or frozen at the connection point to the back of the refrigerator, especially if the fridge is pushed close to the wall with poor clearance.
DIY PossibleFailed or Clogged Water Flow Sensor
Mineral scale from hard water coats the paddle wheel of the flow sensor, preventing it from spinning freely. The clogged paddle does not spin when water flows, so the board reads zero flow. The sensor housing can also crack, causing complete failure.
Requires ProfessionalLow Household Water Pressure
LG refrigerators require 20–120 PSI of water pressure. If household pressure drops below 20 PSI — common in homes with old pipes, heavy simultaneous use, or a failing pressure regulator — the flow rate falls too low for the sensor to detect.
DIY PossibleSafe Checks You Can Do
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1
Check the Water Supply Line and Shutoff Valve
Pull the refrigerator away from the wall and verify the water supply line is not kinked or crushed. Make sure the shutoff valve (usually behind or under the sink, or behind the fridge) is fully open. Straighten any bends in the line.
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2
Test the Dispenser Water Pressure
Place a measuring cup under the water dispenser. Dispense water for exactly 10 seconds. A properly pressured LG refrigerator should deliver 13–16 oz in 10 seconds. Significantly less indicates a supply pressure or blockage issue before the flow sensor.
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3
Replace the Water Filter
A severely clogged water filter restricts flow enough to trigger the Er gF error. If the filter is more than 6 months old or the filter change indicator is on, replace it with a genuine LG filter or temporarily bypass it (if your model has a bypass cap) to test whether flow improves.
When to Call a Professional
Contact a qualified technician if:
- Supply line pressure is adequate but sensor still reports no flow
- Flow sensor paddle wheel is clean but sensor reads zero — sensor has failed electrically
- Replacement flow sensor installed but error persists — control board input circuit fault
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