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

Rain Bird ESP 14-Year-Old Blowing Fuses—Controller vs. Field Isolation

14-year-old ESP blows fuse instantly on power-up (not in water mode). Replaced fuse twice—blew immediately.

Isolation Test

  1. Open controller, locate terminal strip
  2. Disconnect COMMON (C) field wire
  3. Install new fuse, power on
  4. If fuse BLOWS → controller internal short
  5. If fuse HOLDS → field wiring/solenoid short

Next Steps

  • Controller short: replace controller (not repairable)
  • Field short: test each solenoid (20-60 Ohms), check wiring
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