Error code · Dryer

LG Dryer Code IF: Two-Part Filter Check

Low risk · DIY check OK

Code: IF
Appliance: Dryer
Brand: LG
Warranty: 30-day workmanship

What IF means

On LG electric, gas, heat-pump, and steam dryers, IF means the lint filter is not detected. The filter has an exterior part and an interior part, and both must be assembled correctly. The interior part holds a magnet that the dryer uses to sense the filter. If the parts are separated, or the magnet is gone, the dryer behaves as if no filter is installed and will not run.

Common causes of IF

The two filter parts not clipped together
The magnet in the interior filter missing or loose
A damaged filter holder
The detection sensor not reading the magnet

✓ One safe check you can try

1. Take the filter out and separate the exterior and interior parts, then clean both. 2. Put them back together firmly and check that the magnet is still in place. 3. Reinsert the filter. If the magnet or holder is lost, replace the filter.

! Why to stop there

If IF remains with an intact, seated filter, the sensor that reads the magnet needs testing.
A replacement filter that does not match the model can also fail detection, and we check the fit.

Opening a panel yourself does not automatically cancel a manufacturer warranty, but it can cause accidental damage, and some manufacturers set their own service conditions. Check your warranty terms, or ask us, before deciding.

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IFIF questions

Why does IF mention a magnet?

The inner filter has a magnet, and the dryer senses it to know the filter is installed. Without the magnet, the dryer cannot detect the filter.

My filter looks fine. Why IF?

Both parts must be assembled correctly. A part that is slightly out of place may not line up with the sensor, so take it apart and reassemble it.

Can I buy a replacement filter?

Yes, when the magnet or holder is gone, replacing the filter is the fix. Choose one made for your model so the magnet sits where the sensor expects it.

Book a visit

Still unsure about IF?

A technician diagnoses it on site and gives you the price in writing before any work starts.

(713) 597-5662