I’m stumped. Starting about two weeks ago, our sprinkler zone needs to run twice through the controller to achieve proper pressure. The system works fine if I manually turn the solenoid. I’ve replaced the solenoid, the diaphragm, swapped wires with a different zone and tried a different zone on the controller. Flushed the valve. All our other zones (1 sprinkler, 3 drips) appear to be working fine.
Any ideas what it could be? Do I need to replace the entire valve?