Single Sprinkler Station Fails: Diaphragm Replacement Fix

When one zone (station) won't run but works briefly if you quickly advance to the next station, the diaphragm in that zone's valve is torn or deformed—it needs pressure from a second zone to seat enough to open partially.

Why the Workaround Works

Running two zones simultaneously increases flow and pressure, forcing the damaged diaphragm to open slightly. Alone, it can't overcome the pressure differential.

Fix

1. Identify valve brand/model/size (usually 1").
2. Buy exact-match diaphragm kit (~$10–$15).
3. Shut off water, remove bonnet screws, swap diaphragm.
4. Clean seat area, reassemble.

Resource

IrrigationTutorials.com has photo guides for diaphragm replacement on all major brands (Rain Bird, Toro, Hunter, Irritrol).

This is a 20-minute, $15 fix. Don't replace the valve or controller.