Three Zones Won't Activate from Controller (1, 3, 5)

A 6-zone system: zones 1, 3, 5 won't run from the controller but work manually at the valve boxes. Zones 2, 4, 6 operate normally. The odd pattern (1, 3, 5) suggests a controller or wiring issue, not random valve failure.

Diagnostic Steps

1. Check controller display: Does it indicate zones 1, 3, 5 are "on" when scheduled?
2. If display shows "on" but no water: Controller output or field wiring fault.
3. If display won't allow manual start: Program restriction (odd/even days, interval settings) may block those stations.
4. Test voltage at controller terminals: Should read 24–28 VAC on active zone terminals (common to zone wire).

Common Causes

• Corroded or loose common wire connection at controller or valve manifold.
• Programming error: stations assigned to a disabled program.
• Controller station output failure (less likely for three alternating stations).

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