LG · Dryer Minor
IF — Interior filter assembly fault
IF indicates the interior (secondary) lint filter assembly is missing, improperly seated, or the magnet that confirms its position is missing. The dryer will not run because operating without the filter allows lint into the heat exchanger.
- Keep using it?
- Yes — fix when convenient
- DIY difficulty
- Easy
- Verified against
- lg.com ↗
How to fix it
- Remove the interior filter, inspect for damage, and reinstall fully in the correct orientation.
- Confirm the filter clicks into place; if not, look for missing or broken retention tabs.
- Look for a small magnet embedded in the filter frame — if missing, replace the filter.
- If a known-good filter is installed correctly and IF persists, unplug and access the position sensor in the filter cavity; test continuity with the magnet present/absent.
- Replace the sensor if it does not switch states.
- Reassemble and verify the dryer starts a normal cycle.
Why it happens
Typical signs: IF on display · Dryer will not start · Recently cleaned or removed inner filter
- Interior filter not seated Filter not pushed in completely after cleaning.
- Filter installed backwards Orientation arrow not aligned per manual.
- Missing/dislodged sensor magnet Magnet in the filter housing has come loose.
- Failed reed switch / position sensor Sensor in the cabinet does not detect the magnet.
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 dryer interior lint filter Common replacementAmazon →
More LG dryer 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.