LG Refrigerator Error Code Er gF: Water Flow Issue
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What Error Code Er gF Means
The Er gF code means the refrigerator is not detecting water flow to the ice maker or water dispenser. The flow sensor in the water supply line is reading zero flow when the system expects water. This shuts down ice production and blocks the water dispenser. The problem is either a supply-side issue (no water getting to the fridge) or a component failure inside the refrigerator.
Common Causes
Frozen water supply line
The small-diameter water line that runs from the inlet valve to the ice maker freezes solid. This is very common in LG refrigerators where the line passes through the freezer door or compartment.
Failed water inlet valve
The solenoid-operated inlet valve at the back of the refrigerator does not open when commanded. The solenoid coil burns out, or mineral deposits clog the valve seat.
Kinked or clogged supply line
The copper or braided supply line behind the refrigerator is kinked from pushing the unit against the wall. Mineral deposits also clog the line over time.
Low household water pressure
LG refrigerators require at least 20 psi of water pressure at the inlet valve. Pressure below this threshold causes the flow sensor to read zero flow.
Failed flow sensor
The turbine-style flow sensor in the water line fails mechanically or electrically. Water flows, but the board gets no signal confirming it.
How to Fix It
- 1
Check the water supply valve
Find the water shutoff valve behind the refrigerator (usually at the wall). Confirm it is fully open. Turn it off and back on. If the valve is a saddle-type valve on a copper pipe, these are notorious for clogging. Consider replacing it with a proper quarter-turn ball valve.
- 2
Inspect the supply line for kinks
Pull the refrigerator out from the wall. Check the water supply line (copper, plastic, or braided stainless) for kinks, sharp bends, or visible damage. Straighten any kinks. Replace a damaged line with a braided stainless steel supply line.
- 3
Thaw a frozen water line
If water works at the dispenser but the ice maker is not filling, the line between the inlet valve and the ice maker is likely frozen. Unplug the refrigerator for 6-8 hours with the doors open to thaw everything. Alternatively, use a turkey baster to squirt warm water into the ice maker fill tube from inside the freezer.
Place towels under the refrigerator to catch melt water.
- 4
Test the water inlet valve
Unplug the refrigerator. Remove the rear lower access panel. Locate the water inlet valve (where the supply line connects). Disconnect the wire harness. Use a multimeter on the 2K-ohm range to test each solenoid coil. Expect 200-500 ohms per coil. OL means the coil is burned out. Replace the inlet valve assembly.
Shut off the water supply before disconnecting any water connections.
- 5
Check water pressure
Disconnect the supply line from the inlet valve. Hold the line over a bucket. Turn the supply valve on briefly. Strong, steady flow indicates good pressure. A trickle indicates low pressure or a clogged line. Use a water pressure gauge on a nearby faucet to verify at least 20 psi.
When to Call a Professional
Frozen fill lines often refreeze within weeks because the root cause is a faulty fill tube heater or an airflow problem. If thawing fixes the issue temporarily, a technician needs to diagnose why the line is freezing. TruePro's $59 diagnostic is credited toward the repair. We carry inlet valves and flow sensors on our trucks for same-day service. 90-day warranty on parts and labor. CA License #51112. Call 877-378-3111. First-time customers save 15% on labor with code NEW15.
Estimated Repair Cost
| Option | Estimated Cost |
|---|---|
| DIY (parts only) | $25 - $90 |
| Professional repair | $160 - $320 |
DIY cost covers a water inlet valve or supply line. Professional range includes diagnosis, parts, and labor. Frozen line repairs with fill tube heater replacement run toward the higher end.
See full refrigerator repair cost breakdown βLG Refrigerator Er gF β FAQ
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