Pro-C System Runs But No Pressure: Valve Adjustment Fix

Sprinkler Heads Barely Pop Up: Common Startup Issue

Pro-C 6-zone system appears to run (controller shows operation, house pressure drops) but heads only pop slightly with minimal spray.

Immediate Checks

1. All supply valves fully open? Including backflow preventer test cocks and main isolation valves
2. All drain valves closed? Winterization drains often left open
3. Adjust each zone valve: Flow control open fully, close fully counting turns, reopen halfway

Why This Happens

After winterization, valves often have flow controls partially closed or debris in the diaphragm chamber. The standard adjustment procedure ensures proper pressure differential for full diaphragm lift.

If adjustment doesn't restore pressure, check for mainline leaks or partially closed gate/ball valves upstream.