Hardie 6100 Zone 2 Stays On: Controller Port or Valve Fault?

Zone 2 Remains Active During Other Zones, Reducing Pressure

1. Measure AC voltage on controller port 2 while another zone runs. Should be 0 VAC. If 24 VAC present, the controller port is damaged—move the wire to a spare port.
2. If port voltage is correct, the zone 2 solenoid is likely stuck—replace it.
3. If solenoid replacement doesn’t help, inspect the valve diaphragm and replace if damaged.