Three-Zone System: One Zone No Water, Pump Runs—Valve Diagnosis

3-zone system: 2 zones work, 1 zone — pump runs but no water. Need help.

Systematic Checks

Voltage at solenoid: 22-26VAC when zone active?
Solenoid operation: Hear/see plunger move? Unscrew solenoid (water off) to test mechanically
Diaphragm: If solenoid works but no water → diaphragm failed, replace

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