Near the end of last summer my sprinkler system stopped working. It began by water coming out of the back flow preventer when the sprinkler was scheduled to turn on. It worked fine months and days before. I replaced the pop and bobet but same problem. I shut the system down for the winter. Last week I turned it on and same problem. I did find a solenoid that was cracked and leaking water. I replaced but same problem I do notice that when I turn a zone water just bubbles out and I have no pressure at any of the sinks in the house.