Botanic Garden >> Gardening > >> Question and Answer >> Irrigation

Irritrol RD-900 Flashing LCD, Manual Start Shows OFF: Shorted Valve or Wire

Manual Button Flashes Run Time Then Shows OFF

Short in valve solenoid or its wiring.

Find Faulty Zone

Test zones manually one by one. Zone that triggers OFF has the fault.

All zones trigger → wiring issue (common short).
One zone → replace that solenoid.

Irrigation: Hunter ICC "P Err" Error: Master Valve/Pump Start Solenoid or Wiring Fault; Irritrol KD6-INT Zone 4 Stuck On: Valve Diaphragm or Solenoid Plunger; RD‑900: Three Stations Work Intermittently – Circuit Board or Wiring Fault?; Irritrol 476PR Shows “1FUS” and Drains 9 V Battery in Days; Irritrol KD9 Flashing "FUSE" with All 9 Zone Numbers; Two Zones Dead After Wire Repair? Check Valve Voltage & Water Supply; Hunter Pro-C OP ERR / IC ERR: Reset & Check Master Valve/Pump Circuit; Irritrol KD-9 "Fuse" Display: Systematic Solenoid and Wiring Check; Hunter ICC: All Zones Show 26V Simultaneously—No Water Flow; Resolving "Master Valve" Errors on Irritrol Controllers

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