LG · Refrigerator Moderate

Er gF — Water flow sensor / low water pressure

The flow sensor in the water dispense circuit didn't detect adequate flow during a dispense — usually a closed/kinked supply line, clogged filter, or low household water pressure.

Keep using it?
Yes, with caution
DIY difficulty
Easy
Verified against
lg.com ↗

How to fix it

  1. Confirm the water supply valve is fully open.
  2. Pull the unit out and check the water line behind it for kinks.
  3. Replace the water filter if it's older than 6 months.
  4. Test household pressure at a nearby faucet (need 20+ psi).
  5. Disconnect the supply at the inlet valve and flush a cup into a bucket — verify flow.
  6. If flow is good to the valve but dispenser still fails, replace the inlet valve assembly (which includes the flow sensor on most LG models).

Why it happens

Typical signs: Er gF on display · Dispenser produces little or no water · Ice maker may stop producing ice · Water filter status normal but no flow

  • Closed or partially open supply valve Saddle valve or shutoff at the wall not fully open.
  • Kinked water line Common behind the refrigerator after a recent move.
  • Old/clogged water filter Filter past 6 months severely restricts flow.
  • Low household water pressure LG requires 20–120 psi at the inlet.
  • Failed inlet valve or flow sensor Solenoid coil weak or sensor circuit failed.

Replace your water filter

A clogged or overdue water filter is a common cause of low water and ice flow on LG refrigerators — they are meant to be changed about every 6 months. The OEM-style filter that fits most LG refrigerators is the LT1000P ($45-55 OEM, $18-28 compatible).

  • LG LT1000P refrigerator water filter OEM water filter
    Amazon →

Not sure which filter fits your model? See the full compatibility guide →

Parts you may need

If diagnosis points to a failed part, these are the common replacements. As an Amazon Associate we earn from qualifying purchases.

  • LG water filter (LT1000P / LT800P) Common replacement
    Amazon →
  • Water inlet valve assembly Common replacement
    Amazon →

Related repair guides

LG Refrigerator Water Filter Guide (LT1000P, LT800P & More) →Refrigerator Ice Maker Not Making Ice — Causes & Fix →Refrigerator Water Dispenser Slow or Not Working — Fixes →Refrigerator Water Tastes Bad or Smells — Causes & Fix →

More LG refrigerator codes

22 22 — Compressor relay / inverter control fault 33 33 — Compressor / defrost test fault 67 67 — Door open / not fully closed 88 88 — Power-on display test (not a fault) Er CF Er CF — Condenser fan motor feedback fault Er CO Er CO — Communication error (main board ↔ display)

All LG codes → All refrigerator codes →

Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician. Verified against manufacturer documentation: lg.com.