LG · Refrigerator Moderate

Er IS — Ice maker fan motor / sensor fault

The ice maker compartment fan or ice maker sensor is open, disconnected, or stalled — most often frost on the ice room fan or a failed sensor in the ice room.

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

How to fix it

  1. Empty the ice bin and leave the freezer/ice door open for 8+ hours to defrost.
  2. After drying, restore power and watch for Er IS.
  3. If it returns, remove the ice room cover and check the fan for free rotation.
  4. Reseat the ice-room sensor and fan harness connectors.
  5. Replace the ice-room fan motor if stalled or noisy.
  6. Replace the ice-room sensor if out of resistance spec.

Why it happens

Typical signs: Er IS (or Er 1S) on display · No ice production · Frost in the ice compartment · Ice room warmer than normal

  • Iced/stalled ice-room fan Door seal leak lets humid air freeze the fan.
  • Failed ice-room fan motor BLDC fan failed mechanically or electrically.
  • Disconnected ice maker sensor Connector unseated during service or by vibration.
  • Failed ice maker sensor Open NTC sensor in the ice compartment.

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.

  • Ice room fan motor Common replacement
    Amazon →
  • Ice maker compartment sensor 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.