I had a similar problem and it was solved by putting the valves in the right position. It was kind of embarrassing because I made a big deal about it , but hey - you live and learn. someone a while back posted some pictures of the proper valve positions, so you may want to search on it. There was also a great suggestion to take pictures of winterized positions and working positions, print it and put it in the tank area for future reference. With my terrible memory, I plan on doing that if I ever remember to take the pictures.
Mike and Kathy