On a 5-station Hardie HR 6200 system, station 1 makes a loud pressure sound but no water exits the heads. Other stations work fine. The owner lacks a manual.
Adjustment procedure: Turn the knob on top all the way open, then all the way closed (count turns), then open halfway.
If adjustment doesn't help, inspect the valve diaphragm and ports for debris. A manual for the HR 6200 may be found online by searching the model number.
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