FO Minor Easy DIY

LG Dryer FO (Filter Out) — Lint Filter Not Installed

LG Dryer · Error code FO

What FO Means

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

Symptoms

  • FO or "Insert Filter" message
  • Cycle will not start normally

Common Causes

1
Lint filter missing or not seated

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

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.

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.

Common replacement LG Dryer Lint Filter View on 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 →

Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician.