Booster pump never runs. Could be relay, controller signal, or pressure increase.
Orbit Timer Pump Start Fails: Voltage Drops Under Load, Controller or Wiring Fault
Hunter Pump Start Relay Not Clicking? Check Voltage at Controller & Relay
Hardie Controller: Pump Won't Start — Test Controller, Relay, Wire, Pump
K-Rain 1522 Pump Start Relay Not Engaging Pump
James Hardie Controller (c. 1993): MV Terminal & Pump Start Issues
Irritrol RD-600: Pump Relay Trips on Zone 3 - Shorted Solenoid
Rain Bird ESP Controller Interference from 220V Service Disconnect
Hunter EC Controller Runs Pump in Reverse: Relay Wiring Fix
Sprinkler Pump Trips Breaker: Is a $1,400 Motor Replacement Justified?
Sprinkler Pump Runs but No Pressure – Common Causes
Intermittent Master Valve Fault on Toro Ecxtra Controller
Toro Extra Timer & Hunter PSR-22 Relay: EMF Interference Myth
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