To any kind experienced sprinkler person, I only have 3 zones. when i hold down the up/down simultaneously in auto mode to test run, only 2 zones come on. 1 of the 3 zones do not come on automatically. I am able to manually turn valve to operate 3rd zone. I have found only 2 cans hence 2 valves total in the yard. At one time I was told all 3 zones worked. I have 3 zones wired to control panel. Is it possible to have 2 zones operate off 1 solinoid valve? Do I need something else to make the 3rd z...
