LG Dryer IF Error — Lint Filter Assembly Fix

What it means

LG dryer IF is the lint-filter-not-assembled code.
LG dryers use a magnet on the lint filter to confirm it's fully seated — if the dryer can't detect the magnet, it shows IF and won't run.
This is a safety check: running without the lint filter sends lint straight into the exhaust system and creates a fire risk.

Affected Models

LG DLE / DLG series electric and gas dryers
LG DLEX / DLGX TurboSteam series with steam
LG Signature and Studio series premium dryers
LG DLHC series compact heat pump dryers
LG WashTower combo units (shared dryer module)

Common Causes

Lint filter not pushed fully home — magnet not lined up with sensor
Lint filter inserted backwards or upside down
Magnet missing from the filter (broken off or lost)
Lint filter sensor in the dryer body damaged or coated with lint
Wrong replacement lint filter (model without the magnet)

How to Fix It

Pull the lint filter out and reinsert firmly.

Pull the filter all the way out, brush off any visible lint, and reinsert with a firm push until it clicks into place.
A gentle push isn't enough — the magnet has to physically reach the sensor in the dryer body for the IF code to clear.
Check filter orientation.

LG lint filters have a specific orientation — the tab usually faces one direction.
If you've removed the filter for cleaning and pushed it back the wrong way, IF will appear.
Look at the molded shape — it should sit flat inside the housing with the handle on top.
Confirm the magnet is still attached.

Look at the bottom edge of the lint filter.
There should be a small round magnet embedded in the plastic frame.
If you can see a hole where the magnet should be, it's fallen off — order a replacement filter, the magnet isn't separately available.
Wipe the sensor area.

With the filter out, look inside the filter housing with a flashlight.
The sensor is a small recess at the bottom of the housing where the magnet seats.
Wipe out any lint or dust with a damp cloth — built-up lint can dampen the magnetic field.

When to Call a Professional

Almost every IF clears in seconds with a firmer push of the lint filter.
If the filter is fully seated correctly and IF still shows, check that the small magnet on the filter is still in place — it's a small disc that can fall off if abused.

Frequently Asked Questions

Can I run the dryer without the lint filter if I keep getting IF?

No — that's specifically what the IF code is designed to prevent.
Running an LG dryer without a properly-installed lint filter sends lint directly into the heat exchanger or vent system, creating a fire risk AND damaging the heat exchanger surfaces.
The IF safety interlock is required and not bypassable.
If your filter is damaged, order an LG replacement — it's an inexpensive accessory — before running the next cycle.