LG LP1214GXR - Manual (Page 23)

If you wish to use the DRY mode because the unit is running in high humidity or for other reasons,
remove the drain cap and rubber plug from the back of the unit.
Purchase and install a drain hose (1/2" inside diameter) on the back of the unit and place the
open end of the hose in a suitable drain location or outdoors.
The water collection tank is full. Drain the tank and restart the air conditioner.
USE OF A DRAIN HOSE WHEN USING THE DRY MODE
FL APPEARS IN THE DISPLAY