LG Refrigerator Error Code Er gF — What It Means & How to Fix It

What Does This Error Mean?

The Er gF error means the water flow sensor in your LG refrigerator has detected a problem. This sensor monitors water flowing through the refrigerator to the dispenser and ice maker. When it fails or reads incorrectly, water dispensing or ice making may stop. This is usually fixable without professional help — start with the water filter.

Affected Models

LRMVS3006S
LRFXS2503S
LRMDC2306S
LFXS26973S
Most LG refrigerators with water dispensers and ice makers

Common Causes

Clogged or expired water filter restricting water flow through the system
Faulty flow sensor that is not accurately measuring water movement
Kinked or frozen water supply line reducing water flow to the refrigerator
Water supply valve behind the refrigerator not fully open
Low household water pressure — below the minimum required for the sensor to register flow

How to Fix It

Locate the water filter on your LG refrigerator and check when it was last replaced.

LG recommends replacing the water filter every 6 months. A clogged filter is the most common cause of Er gF. The filter is usually inside the fridge compartment or in the grille at the bottom.
Replace the water filter with a new LG-compatible filter.

After installing the new filter, run about 2 gallons of water through the dispenser to flush out air and carbon dust.
Check the water supply valve behind the refrigerator.

It should be fully open — turned counterclockwise until it stops. A partially closed valve reduces flow and can trigger Er gF.
Inspect the water supply line for kinks or freezing.

Pull the fridge away from the wall carefully. Straighten any bent sections of the supply line. If the line is frozen, see our FF (freeze) guide.
Unplug the fridge for 5 minutes and plug it back in after checking everything.

A power reset combined with improved water flow often clears Er gF after you have fixed the underlying cause.

When to Call a Professional

If replacing the water filter and checking the supply line does not clear Er gF, the flow sensor needs professional testing. Flow sensor replacement involves accessing the water inlet area. Contact LG support at 1-800-243-0000 or a certified appliance repair service. Expect repair costs of $130–$260 for a flow sensor replacement.

Frequently Asked Questions

Will Er gF stop my ice maker from working?

Yes — the ice maker needs water flow to produce ice. If the flow sensor detects insufficient flow, it shuts down the ice maker as a protective measure. Fixing the underlying cause (usually a clogged filter) typically restores ice making within 24 hours. Allow up to 24 hours for the first batch of ice after the repair.

How often should I replace the water filter on my LG refrigerator?

LG recommends replacing the water filter every 6 months. If your water is hard (high mineral content), you may need to replace it more often — every 3–4 months. The display panel usually shows a filter status indicator. Always use an LG-certified filter or an NSF-certified compatible replacement.

What is the minimum water pressure my LG refrigerator needs?

LG refrigerators require between 20 and 120 PSI of household water pressure. Below 20 PSI, the flow sensor may not register adequate flow, triggering Er gF. You can test your home water pressure with an inexpensive gauge from any hardware store. If pressure is too low, a plumber can advise on solutions.