SPRINKLER TALK FORUM - You Got Questions, We've Got Answers

when that particular zone is calling to be on,you should read 24v +/- 10% between common and that zone terminal. remove that zone wire make that zone call if 24v is between that zone terminal and common,you know the controller is good.if your reading almost 0 volts with the zone calling you have no potential difference meaning you're reading the same leg with your meter.it's like putting your meter across a live fuse to read volts you'll read 0.disconnect valve solinoid and controller ohm out wires if there's continuity it's a bad wire.i would suggest to call a pro.i try not to make a habit of giving step by step instructions because us contractors have to eat too.

You may have a short in your wiring. Like water miser said, you should be reading 24 VAC between the common and zone terminals. Have you done any digging or construction in your yard since you have been having this problem? If so, maybe a wire has been cut.