RJC-600 programmed for 20 min/station runs only 20 sec.
Controller microprocessor is faulty. RJC-600 is obsolete; replace with modern controller (Rain Bird ESP, Hunter Pro-C, Irritrol Rain Dial).
Rain Jet RJC-66 No Operation: Systematic Checks or Replace Controller
Rain Jet RJC-66 Zone 2C No Water in Auto: Valve Diaphragm or Solenoid
RainJet RJC‑6‑1 Timer Needs Replacement – Does RJC‑66 Support Pump Start?
Rain Jet RJC-4 Controller Error: Reset with Battery Removed
Replacing Obsolete Rain Jet 8800 Sprinkler Heads
Rain Jet Timer Replacement Recommendation
Rain Jet System: Finding Compatible 1" Brass Anti-Siphon Valve
Rain Jet RC6 Timer: Zone 2 Won’t Shut Off – Valve Stuck
Rain Jet RJC‑66 Flashing “6A” and “6C” – Programming Overlap
Testing a Rain Jet RJC Four Timer: Fuse, Transformer, Zone Output
Irritrol RD600 9V Battery Draining Weekly—Controller Failure
Finding Replacement Heads for Vintage Rain Jet Roof Sprinklers
Rain Jet Sprinkler Parts for 28-Year-Old System: Try Contractor Suppliers
Rain Dial 6/9/12 Station Controller Dead After 10 Years: Reset or Replace
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