Zone 1 Heads Don't Pop Up: Valve Flow Control or Diaphragm

Single Zone Low Pressure After DIY Spring Startup

All zones work except zone 1. Heads leak but don't pop. Prying one up gives weak spray. Other zones good. Landscaper usually does startup.

Flow control too closed – Adjust: open fully, close fully (count), open halfway.
Diaphragm or port issue – Valve not opening fully. Disassemble, clean, or replace.

Since you did the startup, double-check you didn't leave a valve partially closed. Adjust flow control first.

Irrigation: Nelson Controller: Zone 2 Runs With Every Other Zone — Wiring or Valve Issue?; Zone 3 Runs With All Others: Wiring Cross or Pump Start Wire Fault; All Zones Come On Simultaneously – Stuck Solenoids or Valve Debris; Hunter Pro-C Zone 5 Not Running: Valve Solenoid or Diaphragm Issue; Flooded Valve Boxes After Rain: Waterproof Wire Connections to Protect Controller; Hydrotek 6000 Valve Won't Cycle to Next Zone; All Sprinkler Zones Run Simultaneously: Controller or Valve Fault?; Sprinkler Zones Running Simultaneously: Controller Troubleshooting; All Sprinkler Zones Dead: Controller Reset & Valve Flow Check; Low Pressure All Zones After Winter: Systematic Diagnosis

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