Rain Bird 600: Manual Mode Zone 2 Opens Zone 1 Instead

Rain Bird 600 system. Manual mode: zone 1 works normally. Zone 2 selected → zone 1 opens, zone 2 doesn't.

Diagnostic: Swap Solenoids

1. Swap solenoid from valve 1 to valve 2
2. Test manual zone 2 again

• If zone 1 still opens → Debris in valve 1 body preventing closure
• If zone 2 now opens → Original zone 2 solenoid was bad

If Valve 1 Has Debris

1. Shut off water
2. Disassemble valve 1
3. Clean all passages, inspect diaphragm
4. Reassemble carefully aligning all holes

Most Likely

Bad solenoid on zone 2. Solenoids fail more often than valve bodies get debris stuck open.