Make sure you are running only one zone at a time. Often times heads or if they have filter screens they will plug up. Pull the riser up on the head with the issue, if it's in ground put a vice grip on it at ground level to keep it from dropping back into the ground. Take the top, rotor or spray, off the top of the pipe and turn on the water to that circuit. If water sprays six to eight feet in the air it's not a pressure problem, its an obstruction in the rotor or spray itself.
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