Check for a cut wire. look at your system from what works and what doesn't. Try to think if you had the phone company, Cable Company, New internet, Landscaping, Gas line, New decking, get the idea, out last year? Where did you make a landscaping change you probably have a cut wire. One way to easily check this if you don't have a volt meter is to run a temporary wire to the valve not working and see if it works. Hopefully, it is not too far. You of course can hire a pro if that sounds like too much to get in to.
Dan
Good Luck