Richdel 500 PRI Display Shows On But No Sprinklers: Test Controller Voltage Output

Manual Valve Operation Works, Automatic Doesn't

Systematic voltage testing isolates fault:

1. Test controller: run Zone 1, measure terminal #1 vs C/common. Need 22–26 VAC.
2. If good, test at valve wires (disconnected from solenoid).
3. If good at wires, reconnect, remove solenoid, run zone — check plunger lifts.
4. If plunger lifts, valve diaphragm faulty — replace.

Resource

irrigationtutorials.com for diaphragm replacement guide.