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Error code guide

LG Refrigerator Error Codes: Er FF, Er IF, Er dH, Er CO & More

LG refrigerators show 'Er' followed by a short code when a fan, sensor, defrost part or board has a problem. Several fan codes are caused by frost or ice blocking the fan, which usually points back to a defrost or door-seal issue. Some codes can be cleared with a reset or a manual defrost; others need a technician.

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Summary of LG Refrigerator Error Codes
CodeMeaning
FF / Er FFFreezer fan motor error — often ice blocking the fan.
rF / Er rFRefrigerator fan motor error — usually from frost build-up.
IF / Er IFIce maker fan error — frost or ice build-up, or a failed fan.
dH / Er dHFreezer defrost fault — the defrost system isn't working.
CO / Er COCommunication error between the control board and the display.
gF / Er gFFlow sensor error, or low water pressure to the dispenser and ice maker.
22 / Er 22Compressor relay problem.
OFFNot a fault — demo (display) mode is on and cooling is disabled.

FF / Er FF — Freezer fan motor error

Freezer fan motor error — often ice blocking the fan.

Common causes

  • Frost or ice around the freezer fan
  • Defrost system problem
  • Failed fan motor

Try this first

  • Do a manual defrost (unplug, doors open 8+ hours), then restart

When to call: If Er FF returns after a manual defrost, the defrost system or fan motor needs repair.

rF / Er rF — Refrigerator fan motor error

Refrigerator fan motor error — usually from frost build-up.

Common causes

  • Frost blocking the fresh-food fan
  • Failed fan motor

Try this first

  • Manual defrost, and check the doors close and seal fully

When to call: Repeated rF codes mean something is letting frost build up — we find and fix it.

IF / Er IF — Ice maker fan error

Ice maker fan error — frost or ice build-up, or a failed fan.

Common causes

  • Ice on the ice-maker fan
  • Misaligned door or worn gasket letting humid air in
  • Failed fan motor

Try this first

  • Manual defrost
  • Check door alignment and gaskets

When to call: In humid Pinellas kitchens, a small door gap can ice up this fan quickly. We repair the fan and the cause.

dH / Er dH — Freezer defrost fault

Freezer defrost fault — the defrost system isn't working.

Common causes

  • Ice build-up on the evaporator
  • Blown thermal fuse
  • Failed defrost heater
  • Main board problem

Try this first

  • Unplug for 2 minutes to reset

When to call: If dH persists, the defrost heater, fuse or board needs testing. Left alone, the freezer ices over and cooling drops.

CO / Er CO — Communication error between the control board and the display

Communication error between the control board and the display.

Common causes

  • Loose or damaged wiring, often through the door hinge
  • Failed display or main board

Try this first

  • Power-cycle the refrigerator once

When to call: Needs a technician to trace the wiring and test the boards.

gF / Er gF — Flow sensor error, or low water pressure to the dispenser and ice maker

Flow sensor error, or low water pressure to the dispenser and ice maker.

Common causes

  • Low household water pressure
  • Clogged water filter
  • Partly closed supply valve or kinked line

Try this first

  • Replace an old water filter
  • Make sure the supply valve is fully open and the line isn't kinked

When to call: If pressure is good and the code persists, the flow sensor or valve needs service.

22 / Er 22 — Compressor relay problem

Compressor relay problem.

Common causes

  • Failed compressor relay or related control circuit

Try this first

  • None — check the fridge temperature and protect your food

When to call: Call promptly — the fridge may stop cooling. We test the compressor circuit properly before recommending any major repair.

OFF — Not a fault

Not a fault — demo (display) mode is on and cooling is disabled.

Common causes

  • Demo mode activated accidentally or left on from the store

Try this first

  • On many models, open the fridge door and hold Refrigerator + Ice Plus for 5 seconds; check your manual for your model

When to call: No repair needed unless the fridge still won't cool after leaving demo mode.

How to reset

Unplug the refrigerator for about 2 minutes, then plug it back in. For fan codes caused by ice, LG recommends a full manual defrost: empty the fridge, unplug it and leave the doors open for at least 8 hours (put towels down for melt-water).

Codes vary by model and year. Check your owner's manual for your exact model — if a code isn't listed here, call us and we'll look it up.

Still stuck? We repair LG refrigerators across Clearwater and all of Pinellas County — see LG repair.

Last reviewed 2026-10-07 by Mako Appliance Repair.

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