Have you tried to turn them on by hand at the valve? on my valves at the solenoid there is a knob to turn them on by hand. If they don't come on even then, I'd check the water to make sure its on, then try adjusting the flow control if your valves have it. It's possible if the flow control knob is turned all the way closed water can't get thru the valve even when its turned on (open)
you might also use a voltage meter to check that the controller is sending voltage to the solenoids, but if the controller is the problem then the above method of opening the valves by hand should work. if you're getting voltage at the valves, and they come on when opened by hand, my guess would be bad solenoids, but it would seem weird if all your solenoids went bad at once... Maybe not I'm no expert just sounds unlikely. I am assuming its more than one valve you're having problems with.
This post has been edited 1 times, last edit by "kalivoda" (Jul 8th 2012, 7:54pm)