LG Dryer Error Code FO — Lint Filter Not Inserted Properly
What this means
The FO error code or a flashing INSERT FILTER message indicates the lint filter is not properly seated in its housing. The dryer will not run without the lint filter in place. This can be triggered by a filter that was not pushed all the way in after cleaning, a filter installed backwards, or a damaged filter that does not sit properly.
Step-by-step fix
2 stepsReinsert the lint filter
Remove the lint filter from its slot. Clean off any lint. Reinsert it firmly, making sure it slides all the way down until it stops. Some models require the filter handle to sit flush with the dryer surface.
The filter should slide in smoothly with a slight click or stop at the bottom.
Check filter condition
Inspect the lint filter mesh for tears or damage. If the filter frame is warped or cracked, replace it. A damaged filter may not trigger the sensor correctly even when inserted.
When to call a professional
If the filter is properly inserted and the error persists, the filter detection sensor or switch may need service.
Information compiled from manufacturer service manuals, official troubleshooting documentation, and appliance repair industry resources. This guide is for informational purposes only — always consult a qualified technician for complex repairs.
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