LG · Dryer Minor

FO — (Filter Out) — Lint Filter Not Installed

FO (Filter Out, sometimes shown as a flashing "Insert Filter") means the lint filter is missing or not seated properly.

Keep using it?
Yes — fix when convenient
DIY difficulty
Easy
Verified against
lg.com ↗

How to fix it

  1. Clean the lint filter and push it fully into its slot until seated.
  2. Confirm the message clears; if it persists with the filter seated, check the filter-detection switch.

Why it happens

Typical signs: FO or "Insert Filter" message · Cycle will not start normally

  • Lint filter missing or not seated The filter was left out after cleaning or is not pushed all the way in.

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 Lint Filter Common replacement
    Amazon →

More LG dryer codes

AE AE — Compressor / heat-pump system fault bE bE — Drum drive belt broken or off CL CL — Child Lock / Control Lock active d80 d80 / d90 / d95 — Exhaust Duct Blocked D90 D80 / D90 / D95 — Clogged Exhaust Vent d95 d95 — Exhaust duct ~95% blocked

All LG codes → All dryer codes →

Frequently asked questions

What does the FO code mean on a LG dryer?

FO (Filter Out, sometimes shown as a flashing "Insert Filter") means the lint filter is missing or not seated properly.

What causes the FO code on a LG dryer?

Lint filter missing or not seated: The filter was left out after cleaning or is not pushed all the way in.

Is it safe to keep using a LG dryer with a FO error?

Yes — fix when convenient. This is rated a minor-severity fault.

How do I fix FO on a LG dryer?

Clean the lint filter and push it fully into its slot until seated. Confirm the message clears; if it persists with the filter seated, check the filter-detection switch.

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.