I just turned on the sprinkler system for the year (I'm in Minnesota) and have a problem I have not encountered in the seven or eight years we have had this system. With the water line open, water is coming out at a pretty rapid rate from under the "bell" (not sure if my terminology is correct). Other than that, system is working fine. Can someone help me as to the cause for this, and what I can do to fix it? Thank you very much.
(If it helps, I have a company come and winterize but turn it on myself in the spring.)