Hunter Pro-C All Zones Running Simultaneously: Flow Control Misoperation

Hunter Pro-C System Activates All Zones at Once: User Error with Flow Controls

A homeowner with a new-to-them irrigation system experienced all 5 zones running simultaneously with poor pressure after spring startup. Zone 4 and 5 heads barely popped up. The user had manually opened all solenoids and bleeder screws trying to diagnose.

What Actually Happened

The user inadvertently opened the flow control stems on each valve (the adjustable knob/screw on top of the valve bonnet), not just the solenoids or bleed screws. Flow controls regulate maximum flow through the valve. When fully opened on all valves simultaneously, the system tries to run every zone at once, dividing available pressure among all zones.

Understanding Valve Controls

• Solenoid: Electrical on/off control (plunger lifts to allow water into upper chamber)
• Bleed screw: Manual bleed for air/debris (small screw on solenoid or bonnet)
• Flow control: Adjustable restriction to limit maximum flow (knob on bonnet)

Correct Startup Procedure

1. Ensure all solenoids are in AUTO position (not manually turned on)
2. Close all bleed screws snugly
3. Set flow controls to fully open (counterclockwise) initially
4. Activate zones individually from controller
5. Adjust flow controls only if needed for pressure regulation

Leaking Sprinkler Head Repair

The user also found a leaking Rain Bird 5000 rotor. These are inexpensive (~$10 at home centers) and easily replaced. Common issues: cracked body, worn seal, or debris in nozzle. Clean first; replace if damaged.

Key Lesson

Never manually turn on solenoids or adjust flow controls during normal operation. The controller manages zone sequencing automatically. Manual intervention defeats the programming and causes exactly this symptom.