Hunter Pro-C All Zones Open: Flow Control Misunderstanding

Hunter Pro-C System Runs All Zones: Flow Control Valves Left Open

A homeowner with a Hunter Pro-C system found all zones running simultaneously after manually operating valves. They had turned solenoids and additional "valves" (flow controls) open while troubleshooting pressure issues.

What Are Those Extra Valves?

The "additional valves" in front of each solenoid are flow control stems. They regulate maximum water flow through each valve. When opened fully (counterclockwise), they allow unrestricted flow. When turned down (clockwise), they restrict flow to prevent misting or excessive pressure.

Why All Zones Ran Simultaneously

By manually turning flow controls and/or solenoids to open positions, the user mechanically held all valves open. The controller couldn't close them because they were physically overridden. This is not a controller or wiring fault—it's user operation error.

Correct Valve Positions for Automatic Operation

• Solenoids: In AUTO position (not manually turned on)
• Bleed screws: Snugly closed
• Flow controls: Typically fully open (counterclockwise) unless pressure regulation needed

No Damage from Temporary Manual Operation

Briefly opening valves manually for testing doesn't damage the system. However, leaving them open defeats automatic operation and wastes water. Always return all manual controls to proper positions after testing.

Restoring Normal Operation

1. Close all bleed screws
2. Ensure all solenoids in AUTO position
3. Set flow controls to fully open
4. Run test cycle from controller
5. Adjust individual flow controls only if specific zones need pressure reduction