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Er gF

LG Er gF: Water flow sensor no reading

The water flow sensor is not registering flow to the dispenser or ice maker. Very often the cause is a clogged or overdue water filter rather than the sensor itself.

DIY fix

By the FixByModel editorial team · Verified 2026-09 · Researched against manufacturer support & repair references (below)

Most likely causes

  1. Clogged or expired water filter
  2. Low household water supply pressure or a kinked/closed supply line
  3. Air trapped in a newly installed filter or line
  4. Failed water flow sensor
Before you start — unplug the refrigerator before working on it. Mind sharp metal edges, and never open the sealed refrigerant system — compressor, sealed-system and refrigerant work must be left to a qualified technician.

Step-by-step fix

1Replace the filterInstall a fresh LG-compatible water filter, since a clogged filter is the most common trigger.
2Check the supplyConfirm the water shutoff valve is fully open and the supply line is not kinked or crimped.
3Purge the lineDispense several cups of water to clear trapped air after changing the filter.
4Call a technicianIf the code remains with good water flow, the flow sensor may need professional testing and replacement.

Still showing Er gF?

If you’ve worked through every step and Er gF keeps returning, an internal part likely needs testing and replacement. That’s a job for a qualified appliance technician, who can measure the suspect part against the service-manual spec before replacing it.

Which models this applies to

LG refrigerators. LG refrigerators with a water dispenser and/or plumbed ice maker

FAQ

What does LG Er gF mean?

Water flow sensor no reading. The water flow sensor is not registering flow to the dispenser or ice maker. Very often the cause is a clogged or overdue water filter rather than the sensor itself.

What causes LG Er gF?

The most likely cause is clogged or expired water filter. Other causes include Low household water supply pressure or a kinked/closed supply line; Air trapped in a newly installed filter or line; Failed water flow sensor.

Can I fix LG Er gF myself?

Usually yes. Start by working through the steps above, beginning with: install a fresh lg-compatible water filter, since a clogged filter is the most common trigger.