Hunter Pump Start Relay Not Clicking? Check Voltage at Controller & Relay

If your pump start relay (PSR) doesn't click but sprinklers run when you manually hold the relay in, the issue is in the 24 VAC control circuit — not the pump.

Voltage Test Sequence

1. At controller: run any zone, measure at MV/P (or PS) terminal to Common → should be 22–26 VAC.
2. If low/no voltage → controller faulty or wire broken.
3. If 22–26 VAC at controller, measure at relay coil terminals → same reading?
4. If voltage at controller but not at relay → wire break.
5. If voltage at relay coil but no click → relay coil bad → replace relay.

Common Pitfall

Controller must be programmed with a Master Valve/Pump Start enabled for the active program. Check settings.