LG Dryer Error Code FO
The dryer cannot detect the lint filter in its slot, so it shows FO (or F0) or flashes 'insert filter'. Take the filter out, clear any lint from the housing, and push the filter firmly back in.
Also shown as: F0
Common causes
- Lint filter removed and not put back
- Lint filter not pushed fully into its housing
- Lint or debris packed around the filter housing
- Filter or housing damaged so the filter cannot seat
What to check, in order
- Remove the lint filter and slide it back in until it seats fully in the housing
- With the filter out, clear lint and debris from the empty housing using a soft brush or vacuum
- Check the filter for cracks or warping that stop it sitting flat
- If the message stays with the filter correctly fitted, book service to check the filter detection switch
Clear the code and test
- Fix what the checks above found first. Clearing the code without fixing the cause only brings it back.
- Plug the appliance back in and restore its water supply if it has one.
- Run the shortest programme and watch the point where the code appeared before.
- If the programme finishes with no code, the fault is cleared. If the code returns, write it down before calling a technician — it speeds up the diagnosis.
When to call a professional
Most cases are solved by the checks above. Book a technician if any of these apply:
- The code comes back after you have run the checks and a test cycle.
- You smell burning, see sparks or scorch marks, or the breaker trips.
- Water is leaking and you cannot stop it at the tap.
- The fix needs panels opened beyond what your manual describes, or a part tested with a meter, and you are not set up for that.
When you call, give the brand, the code FO, your model number (on a label inside the door or on the back) and the checks you already ran. It shortens the visit.
Parts that may be involved
Lint filterLint filter housing
Parts are model-specific. Find your model number first — usually on a label inside the door, on the door frame or on the back — and match the part to that number before ordering.
Questions people ask about FO
What does FO mean on a LG dryer?
FO means: Lint filter is out: the dryer cannot detect the filter in its housing. The dryer cannot detect the lint filter in its slot, so it shows FO (or F0) or flashes 'insert filter'. Take the filter out, clear any lint from the housing, and push the filter firmly back in.
Can I fix LG FO myself?
Usually, yes. Code FO is rated DIY-friendly: the checks on this page cover the common causes and use basic household items only. If the code returns after the checks and a test cycle, book a technician.
How do I clear LG FO?
Fix the cause first — clearing the code on its own brings it straight back. Then restore power and water, run the shortest programme, and watch the stage where the code appeared. If the programme finishes with no code, it is cleared.
Sources checked
- LG Help Library: washing machine error codes
- PartsTown Resource Center: LG washing machine troubleshooting codes
The meaning and checks for this code were checked against the sources above in November 2026. Codes vary by model and region; if your manual lists a different meaning for your exact model, follow the manual.