I'm hoping someone out there can shed some light on this. Ive got a zone that when turned on by the clock, it has very little pressure. I found a valve box nearby with three 1"-24v valves on the same manifold. Thinking the solenoid was bad, I turned the solenoids counterclockwise one at a time to see if the zone would come on with full pressure. Well, it did. When the valve in the center of the manifold was manually opened, the zone would function properly, but it would also come on (with low pressure) when the third valve was opened (with the others closed). All the zones worked properly when I took over this account and I haven't changed anything. Any ideas?