Old Sprinkler Valve Shuts Off After 15 Seconds on Drip: Voltage Drop Test

Old valve on drip system. Controller turns on → water flows 15 sec → valve closes (controller thinks 15 min remain).

Standard Voltage/Continuity Test

Tony provides full procedure:

1. Check controller output: 24-27 VAC at COM and zone terminal during run.
2. If voltage good, ohm-test field wiring (solenoid ~30 ohms; 6-8 = short).
3. Disconnect at valve to isolate solenoid vs. wire.
4. Check wire resistance alone (few ohms).

Valve closing prematurely with controller still calling for it = voltage drop (controller, wiring, or solenoid short increasing current draw and tripping controller protection).