"James" wrote in message
net...
It sounds strongly like you are losing water somewhere, as your system
lacks
enough pressure to pop up the heads. Or, the valve on that circuit may
be
defective. Check to see if it has a manual knob that allows you to open
the valve manually, without the need for the electrical valve to work.

If you leave the circuit on long enough, you should be able to see a
concentrated flooded spot somewhere.

James




Would losing water cause only this brand of heads to not pop up fully while
other brands of head (even further downstream ones) pop up and spray freely
and nicely? for example one of them I had three rotors, 3 spray heads of
other brands, 1 shrub head, and 1 misting head all working great, all
downstream of it. The 3 out of 4 Orbit Hardtop spray heads are exhibiting
problems in this particular branch.