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Orbit Timer Pump Start Fails: Voltage Drops Under Load, Controller or Wiring Fault

24V at Pump Terminal No Load, Drops to 1V with Relay Connected

Relay tested OK. Other terminals work. Pump terminal fails under load.

Diagnosis

Check voltage at relay end of wires. If 24V there → relay fault. If 1V → wire fault. But user says other terminals work, even driving relay from station terminal.

Conclusion

Orbit controller pump terminal output stage failed. Orbit not repairable. Replace with Irritrol Rain Dial or Rain Bird ESP — quality, repairable.

Irrigation: Irritrol SR1 Pump Start Relay Chatters After Lightning: Test Controller Output; Nelson SmartZone EZ: Zone 2 Won’t Shut Off – Pump Relay or Controller Fault; Hunter PSR-52 Pump Start Relay Intermittent with ESP-SMT; Hunter Pump Start Relay Not Clicking? Check Voltage at Controller & Relay; Irritrol SR1 Pump Relay Troubleshooting: Voltage Drop Diagnosis; Hardie Controller: Pump Won't Start — Test Controller, Relay, Wire, Pump; Orbit Timer On/Off Flashing: Shorted Solenoids; Zone 2 Works Without Pump, Fails With Pump – Relay Interference; James Hardie Controller (c. 1993): MV Terminal & Pump Start Issues; New Pump Relay Not Activating: Voltage and Compatibility Check

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