ErrorCodeDoctor
LG · Refrigerator (Top Freezer)

LG Refrigerator (Top Freezer) IS error code

Difficulty: Hard · Cost: $100–$300 · Duration: Requires professional service

The IS error means your LG refrigerator has detected a problem with either the ice maker fan motor or the ice maker sensor connection. This code may also appear as 1S on some models. The ice maker fan and sensor work together to maintain the correct conditions for ice production — when either fails the ice maker cannot operate safely. There are no user steps to resolve this error and the unit requires a professional repair service.

Common causes

  • Ice maker fan motor has malfunctioned or failed
  • Ice maker sensor has become disconnected or its wiring is damaged
  • Ice maker sensor has failed completely

How to fix it

  1. 1

    There are no user-serviceable steps for this error

  2. 2

    Unplug the refrigerator and stop using the ice maker

  3. 3

    Contact a qualified technician to inspect the ice maker fan motor and sensor

Related LG Refrigerator (Top Freezer) error codes

1

OF F

Demo mode is active — all cooling has been disabled

easy
2

FS

The freezer temperature sensor has a short circuit or disconnection

hard
3

rS

The refrigerator temperature sensor has a short circuit or disconnection

hard
4

dS

The defrost sensor has a short circuit or disconnection

hard

IS error — frequently asked questions

What does the IS error mean on a LG refrigerator (top freezer)?

The ice maker fan motor has a fault or the ice maker sensor has become disconnected

What causes the IS error?

The IS error is usually caused by: Ice maker fan motor has malfunctioned or failed; Ice maker sensor has become disconnected or its wiring is damaged; Ice maker sensor has failed completely.

Can I fix the IS error myself?

This is rated a hard fix — it often requires tools, parts, or experience, and may be safer left to a professional technician.

How much does it cost to fix the IS error?

Fixing the IS error on a LG refrigerator (top freezer) typically costs $100–$300, depending on parts and whether you do it yourself or hire a technician.

Is it safe to keep using my refrigerator (top freezer) with the IS error?

We'd recommend addressing the IS error before continuing to use the refrigerator (top freezer), since hard-rated issues often involve a real fault rather than a minor glitch.