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I have a one zone system for a planter area. One main pipe with a T. One line to left side of planter and one line to the right off the T. When the system automatically comes on I get flow to the left drip heads but not to the right. If I remove a head from the right there is water flow but just not enough to force thru the head. Now if I open the bleeder screw then tighten and do this a couple of times the right side starts working fine until the next scheduled auto watering. (Under normal conditions should the bleeder screw be closed or slightly open just where water stops coming out of it?) So it seems obvious that it is not a pressure problem or blockage since it will work after messing with the bleeder screw. Hope someone can help.