Two Heads Dry on One Zone: Valve, Pipe, or Clog

One Zone Has Two Heads With No Water: Systematic Check

5 working stages. One stage: two heads dry. Removed head—no water at riser.

Checklist

1. Valve flow control – Adjust (open fully, close fully, open halfway).
2. Broken lateral pipe – Dig along line from valve to heads.
3. Clogged pipe – Debris from install?
4. Valve diaphragm/ports – Clean or replace.

If Long Run, Consider Rerouting

If valve-to-last-head is long, dig new trench alongside old, pull new pipe. Cheaper long-term.

Start with valve adjustment.