I went to a house today with this problem. Fortunately they were able to locate the ball valve to isolate the retic and didn’t have to keep turning their water meter on and off as some people have had to.
If your retic keeps running even when the control box is off then its as simple as a faulty solenoid. If you have a master solenoid and you still have this problem then its as simple as two faulty solenoids!
At the place I went to today station one was stuck on and there as a master valve to supposedly prevent this occurring. It turned out that the master valve had been left ‘on’ manually, so a simple turn of the coil solved that issue. Then I located the station valve and discovered a piece of gluey limestone stuck in it holding the diaprhagm open.
Once this was resolved everything was back to normal.