I wanted to water one zone and I set the dial to run and it flashes for a second then goes back to display the time. I tried this numerous times and once I hear the sprinkler heads pop up trying to run but then the display reverts out of "running" mode. It was working fine this past week. I tried it to run it on manual for all zones and it does the same thing. I'm wondering if there is short in the wiring. Thank-you