12 Zones, 4 Control Valves, one zone not working
The system was installed about 10 years ago, it is on an Orbit Control Panel. I replaced a control valve about 6 weeks ago when 3 zones had lost pressure. I pulled the top of a head and there was muddy water in the head. I turned the zone and could not find a leak in any of the zone head points. There is how ever water standing in the control valve box. any thoughts