To repair, cut main line, flush line, and repair cut. Too many heads on line. Redesign system layout to reduce the number of heads operating at once or reduce flow at each head. Valve won't turn on manually. Low or inadequate flow through valve.
Water leaks out at valve.
Valve 'Barks' or constant loud vibration. Incorrect controller setting. Loose bleed screw. Diaphragm filter clogged. Solenoid O-ring damaged or twisted.