I have a whirlpool dehumidifier ad50gpusao, set to work with the pump. It is properly connected, it works, both the pump and the unit, which i can both hear distinctly. Only thing is the pump doesn't seem to do its work as it should. Even tho water is flowing through the drain hose, water also fills in the bucket, which i have to empty every now and then. What's the problem? Thanks for help. The pipe