I have a Model LAD704DUL dehumidifier, serial # ***** The problem is that it will not do a continuous drain. I have hooked a hose up to it per the instructions and the bucket continues to fill. There is no blockage in the hose. This is the second unit I have purchased and the first one did the same thing. Is there some trick to get it to drain continuously???. There is nothing in the owners manual to address this.