Sprinklers Pop Up Then Shut Off Mid-Cycle: Controller Voltage Drop

All Three Stations Start Then Stop: Electrical Issue at Controller

Sprinklers pop up and spray but shut off prematurely on all 3 stations. Reprogramming timer didn't help.

Diagnosis: Controller Output Failure

The controller likely drops voltage mid-cycle. Could be a failing transformer, relay, or microprocessor.

Test with Multimeter

1. At controller: measure voltage on each zone terminal during run. Should hold ~24VAC steady.
2. At valve: disconnect wire nut, measure voltage on wires during run.

If voltage drops at controller → replace controller. If voltage good at controller but not at valve → wiring issue.

If no multimeter, hire a sprinkler tech—they can diagnose in minutes.