I have zone 1 set as a master. When I run zone 2 I have to turn off the water at the meter and then back on to get Zone 2 started. Once it cycles it will not turn on Zone 2 again manually or via program unlesss you do the above. 

I can manually turn on any other zone and all works fine it’s just Zone 2 that won’t come back on unless go to the meter to close and reopen.