Last week, I had a plumber come to my house because the vacuum break in my sprinkler system froze and broke. This came as a surprise to me because we have always had the system properly winterise.
I had a service call from a plumber who said that the problem is that the shut-off valve upstream from the vacuum break leaked, allowing water to enter the winterised system so and then freeze. He replaced the valve and the vacuum break and gave me a bill for 1030 USD for parts and labor.
After the service was done, we turned on the sprinkler system, and we saw that water gushed out of all the sprinkler heads regardless of the operation of the control panel.
The plumber said that he is not a sprinkler expert and the best thing to do would be to call a sprinkler service company for a service call.
Before I make another potentially very expensive service call, I wanted to ask here what I might do to try to fix the problem.
Again, the vacuum break is fixed, but once the water valves are opened, the water gushes from sprinkler heads all around the yard regardless of the control panel, even when the control panel is set to "OFF".