With the panel unlocked press and hold the air filter or water filter button for 3 to 5 seconds.
Lg ac window unit clean filter light.
Shake the excess water from the filter before putting it back in.
Pull the filter straight up to remove it from the air conditioner.
Remove the air filter from the front grille by pulling the air filter up slightly.
Wash the filter using lukewarm water below 104 f 40 c.
This is to provide a reminder to clean the filter.
Gently shake away excess water from the filter allow it to air dry and reinstall the filter.
It should reset and your problem should be solved the filter warning should be reset.
Pull the inlet grille forward to gain access to the air filter.
Rinse the filter under lukewarm running water until clean.
If step 1 and 2 fails then you can try connecting lg thinq app to your refrigerator.