Question
In one zone or our system we have a line with 5 heads-the first two are Nelson, others are reainbirds. When I turn the line on I get no water from the first three but the last two on the line are dripping water. The fact that they have some water seems to rule out a leak. Any ideas? Tks. pls advise.

Answer
I would check the control valve for this station and assure that it is adjusted properly.  Open it all the way, then close it halfway.  See if this helps.  It is possible that there is something else wrong with the valve, and if this doesnt help, you may need to dissemble it and check for obstructions or damage to the rubber diaphragm inside.