Aprilaire 440 won't stop running

I noticed that we have no hot water and there is a contant flow of water exiting from a PVC pipe coming from the humidifier into the sump pit. I tried adjusting the setting on the humidistat and even turned it to off and the water just keeps flowing. It did stop when I turned the saddle valve all the way off for a little while, but then I won't get any humidity and it is very dry. It is Feb. in Chicago and it's been around 20 degrees and going to be hitting 30. I had the humidity set at 25, and just changed it to 35. I do not want to shut it off, but I do not want the water, hot water heater and sump pump running constantly and I do not want to always be out of hot water.