All Zones Run Simultaneously: Controller or Valve Issue?

When the sprinkler system starts, all zones activate at once instead of sequencing.

Two Scenarios

• Upon Opening Main Water Valve: The irrigation control valves have been manually opened (bleed screws left open). Close the manual bleed on each valve.
• When Using Controller: The controller is faulty. Reset by removing all power (including battery) for 3–5 minutes. Check wiring for shorts at controller and valves. If problem persists, replace the controller.

Most likely a controller issue if zones run together only during programmed cycles.