I just bought my house and I don't know how what is wrong with my sprinkler system. In one zone, that contains 10 sprinklers, when the timer goes off this zone does nothing, no water comes out, the heads don't pop up. I turn it on manually and the heads pop up a little, I get them to pop up fully by just pulling up on one and the rest follow. I had a friend come over and install a new diaphram and a cellanoid, that didn't work. What else could it be?
