LG Dryer Error Code FO: Meaning & How to Fix It

By the ErrorCodePro Editorial Team · Last reviewed October 20, 2026

LG dryer error code FO means: The lint filter isn't inserted properly (FO or a flashing INSERT FILTER). [1] Keep using it? Not until the cause is fixed. Start with the owner checks below, beginning with: reseat the filter.

Quick facts

Code	FO
Also shown as	INSERT FILTER, IF
Brand / appliance	LG dryer
System	Sensors
Official meaning	The lint filter isn't inserted properly (FO or a flashing INSERT FILTER). [1]
Keep using it?	Not until the cause is fixed
DIY-safe?	Owner checks only (listed below)
Support	LG USA Support (lg.com/us/support)

On this page: Meaning · Steps · Parts · When to call a technician · Related codes · FAQ

What error code FO means on an LG dryer

The lint filter isn't inserted properly (FO or a flashing INSERT FILTER). [1]

This is a sensors code. Codes and wording can vary by model, so check your owner's manual for your model number.

How to fix LG dryer error code FO (safe owner checks)

Safety first: disconnect power before you remove any panel or reach into the sump or drum. Do not touch wiring, the control board or the motor. If you see water near electrical parts, stop and call a technician. These steps are based on LG's published guidance [1], rewritten for clarity.

Reseat the filter. Remove the lint filter and reinsert it fully.
Check the magnet. On two-part filters, make sure both parts are assembled and the magnet is in place. Replace the filter if the magnet is lost.

Parts that may be involved

Exact parts depend on your model number. This page lists part types only, never part numbers.

Lint filter

When to call a technician

It continues with a good filter
Anything involving wiring, the control board, the motor or the water valve electrics
The appliance is under warranty: contact LG USA Support (lg.com/us/support) first

Frequently asked questions

What does error code FO mean on an LG dryer?

LG lists FO as follows: The lint filter isn't inserted properly (FO or a flashing INSERT FILTER).

Is it safe to keep using the dryer with FO?

Not until the cause is fixed.

Can I fix LG dryer error FO myself?

Only with the owner checks on this page, starting with: reseat the filter. If it persists, call a technician or LG USA Support (lg.com/us/support).

Is INSERT FILTER the same as FO?

Yes. LG's documentation lists INSERT FILTER, IF with the same meaning as FO; the display format depends on the model.

Sources

https://www.lg.com/us/support/help-library/lg-dryer-error-code-list--20154710772482 (official)

Last reviewed: October 20, 2026. ErrorCodePro is not affiliated with LG.