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Hunter ICC "P Err" Error: Master Valve/Pump Start Solenoid or Wiring Fault

Error Meaning

"P Err" indicates a fault on the Pump Start (PS) or Master Valve (MV) circuit. A wire is connected to the P/MV terminal.

Diagnosis

Disconnect wires from the master valve solenoid.
Run a zone from the controller.
If "P Err" persists: Short in the wiring between controller and master valve.
If error clears: Master valve solenoid is shorted — replace it.

Why This Works

The controller monitors current on the PS/MV terminal. A short (low resistance) triggers the error. Isolating the solenoid determines if the fault is in the coil or the field wiring.

Irrigation: Hardie 2" Valve Solenoid Replacement: Irritrol Parts Compatibility; Irritrol RD-900 Flashing LCD, Manual Start Shows OFF: Shorted Valve or Wire; Rain Bird 600: Manual Mode Zone 2 Opens Zone 1 Instead; Sprinklers Weak Until Bleed Valve Opened – Bad Diaphragm; Hunter Pro-C OP ERR / IC ERR: Reset & Check Master Valve/Pump Circuit; Rain Bird ESP-LX "Fault 4" Code: Zone Skipped; Valves 2 & 4 Low Pressure: Replace Diaphragms, Verify Orientation; How Underground Sprinkler Valve Boxes Stay Securely in Place; Sprinkler Zone Won't Shut Off? Troubleshoot a Stuck Valve; Hunter System: Controller Works But No Water—Check Valves and Main Shutoff

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