Question
I have a Hardie Irrigation HR 6200 irrigation system with 5 stations on a timer.
When station 1 comes on, I hear water flowing, but there's a loud-pressure
sound and water does not flow out of the shower heads. The other Stations work
fine. How do I deduce where / what the problem is? Also, I've been unable to
locate an owner's manual.

Answer
If the water is flowing but nothing coming out of the sprinklers, check for a leak in the sprinkler line near the valve.  Also, try adjusting the valve by turning the knob on top all the way open, then all the way closed, counting the turns, then open it halfway.  It may be that the valve is just shut off and needs to be opened.