If the tank light on your dehumidifier will not goout please check the following:- Remove the tank, ensure it is empty, and replace- Check that the fill level float is inserted properly. This part indicates when the tank is full. If your dehumidifier is new, the float lever may have become dislocatedduring transit.Note: if this does not resolve your issue you may contact us at this link for assistance or look for the closest service center here.