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Irritrol RD-600-INT Alternate Programs B & C Not Running Automatically

10-year-old Irritrol RD-600-INT runs Program A but not B or C automatically. Manual operation works fine. Battery replaced.

Troubleshooting Steps

Verify Programs B & C have: Start time(s), Days to water, Station run times
Full power cycle: Disconnect power + remove battery → wait 1 minute → reconnect → reprogram
Test each program manually after reprogramming

If Still Failing

Controller microprocessor likely failing. The RD-600-INT is 10+ years old—replacement with modern Rain Bird ESP or Irritrol Rain Dial is recommended. Not worth repairing.

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