How can I fix the water leaking from my humidifier?

I have a Haier dehumidifier, Model DH656E purchased one day ago. Initially the unit was working fine when I tested it. Now after moving it to the basement, I find the water is not going into the bucket but into the floor. Yes the drain plug is tight. I have tried to move it to different areas of the basement thinking it was off balance. It's working great as far as evidenced by the river of water running from the unit. It sounds like the water is being held up in the top of the unit. Could something be clogging the system? I have tried to feel around but cannot find anything obvious.