Hunter ICC All Zones Come On Together: Controller or Wiring Crossed

Manual Start Activates All Zones; Only One Shows 26V at a Time

Low pressure because multiple valves open simultaneously.

Isolation Test

1. At controller, disconnect all zone wires except Zone 1 and Common.
2. Run Zone 1 manually.
3. Measure voltage on other terminals (2, 3, 4…). - Voltage present → controller defective (cross-talk). - No voltage → field wires crossed somewhere (hot wires touching).

Master Valve Check

If wires disconnected but valve doesn't open manually (bleed screw), a master valve may exist (wire on MV/PS terminal). Master valve must open first to supply water.