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How to Check Voltage at Pump Start Relay with Multimeter

To test 24 VAC at relay: touch one lead to each of the two controller wires at the relay coil terminals. Should read 22–26 VAC when zone runs.

Irrigation: Hardie Controller: Pump Won't Start — Test Controller, Relay, Wire, Pump; Diagnosing Recurring Pump Prime Loss After Check Valve Replacement; Diagnosing an 18-Year-Old Hardie Controller with SC Error Codes; Rain Bird System Requires Manual Pump Switch – Relay or Wiring Fault; Irrigation Controller Blows Fuse During Manual Start; Fixing Pump Thermal Overload on Lake-Fed Irrigation System; STA-Rite Pump Loses Prime - Troubleshooting Guide; Flotec Pump Won't Prime – Suction Line Troubleshooting; 17-Year-Old Lawn Pump Failure: Repair or Replace?; Meyers Pump Won't Stay Running: Foot Valve or Contactor

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