My xl200 has been cycling since last Sunday and I'm having a problem with the ato. The valve at the top that shuts off the flow so you can remove the top off tank is leaking. If I open the top valve enough to allow water to get down to the float valve the top valve drips. If I close the top valve enough to stop the drip no water comes out of the float valve even when needed. This drip continues to add top off water even after the float valve is closed, raising the water level too high. What am I doing wrong?