Rain Bird ISM6 Pump Start – Jumper Wire Test Indicates Controller Fault

Pump runs with jumper on 24V input. Controller not energizing MV terminal.

Test

1. Remove bottom panel; access terminal strip.
2. MV terminal should output 22–26 VAC when any zone runs.
3. Meter: common (neg) to MV (pos). No voltage = controller defective.

Replace controller.