Two Zones Dead After Wire Repair? Check Valve Voltage & Water Supply

If two zones won't activate after you've re-stripped wires, replaced solenoids and valves, and swapped wires at the controller — the issue is likely insufficient voltage at the valve or a water supply issue.

Voltage Requirement

Solenoids need ≥24 VAC to open reliably. Measure at the valve wires with zone active:

• ≥24 VAC → valve should open
• <24 VAC → voltage drop in wiring or controller

Water Supply Check

• Are all zones fed from the same main? Verify all isolation valves are open.
• If separate sources (e.g., well + municipal), confirm each is on.

Mechanical Verification

With zone active, slightly open the valve's bleed screw. Water should spray out — confirms valve is opening and water is flowing. If not, check for downstream blockage (crushed pipe, root intrusion).

If Voltage & Water Are Good

Inspect the valve diaphragm and seat for debris. Even new valves can ship with manufacturing residue.