[Coxlandscaping]

Hello all I’ve got a real problem and I’m not sure what may be going on I have a Zone of Hunter Pro Spray body’s with Rain Bird Van Sprays in a Landscape Bed I ran the zone several times to make sure all was working as it should the guys came in put the rock and pine straw down and I went back today to turn the system on in the plant beds and the things will not popup if you hold the stem up on one of them for a min all the heads will popup and you can here the pressure increase I’m not sure what may have happened to cause this as it was working fine the day before thanks for any help

[Inspired]

Sounds like a leak. Maybe a broken risor somewhere. Are all the isolation valves all the way open? Did the rock guys or the straw guys step on a head and crack a risor?

Sometimes the dirt will hold the head in place and make the leak difficult to see right away. Leave the zone on for a bit and see if water pools or runs off somewhere.

[oakleaf]

I had a client who had the same thing. He couldn't understand why when he physically pulled up one of the heads that the pressure increased a tiny bit and the others started to come up.
His cause was that the installer (not me!) had exceeded the pressure/flow capacity on that line with the number of heads, and there is the phenomenon that until the heads (mist or turbine) are fully 'up' - they are not fully sealed around the shaft. This causes further pressure loss - perhaps only a little but - in sector that was already just/just - enough to mean the heads would not come up.
Pulling one or two up creates the seal required on those heads, economising just enough pressure/flow to lift the next and then then the rest rise by the same effect.
Assuming it was working fine before - you either have
1/ A reduction at source (valve partially closed as mentioned by Inspired). Check also that you are not using electronic valves with incorporated flow limiters - these have caught out some of my guys in the past.
2/ A crushed pipe between the first head and the valve (if all your heads are showing an identical problem)
3/ A bad leak somewhere in the sector