The drain hose might be kinked or clogged. First check to make sure the drain hose is not kinked between the humidifier and the drain source. If the drain hose is not kinked, then it might be clogged. Unclog the drain hose by removing it from the drain pan and blowing compressed air through it to clear the obstruction.
The water evaporator pad might be clogged with calcium and other mineral deposits. Once the water evaporator pad is clogged, the water rides along the top of the pad and drips down outside of the water collection tray at the bottom. If water does not exit properly check the water evaporator pad and replace as needed.
A clogged drain hose will prevent the humidifier from draining. You can use compressed air to help clear the obstruction, but you may need to replace the drain hose with a new one to fully resolve the issue.
Highly Likely
04 - Clogged Water Tray Outlet Port
A clogged water tray can prevent the humidifier from properly draining. If the obstruction cannot be cleared, the water tray should be replaced with a new one to resolve the issue.
Highly Likely
05 - Clogged Drain Pan
A humidifier not draining may be caused by a clogged drain pan. Check the drain pan for debris or buildup that may be preventing proper drainage. If necessary, clean the drain pan out. Refer to owner's manual for guidance.