The first thing I would do is put a voltmeter on the output of your controller for one of the zones. I would turn on that zones in manual. I think most sprinkler valves operate on 24 vac. So if the zone is “on” you should see 24 vac on the controller output.
If you do not see 24 vac, then disconnect the wiring on that zone and measure the voltage again. If you do not yet see 24vac, then its a controller issue.
If you do see 24 vac at the controller output, then the controller is working and either the wiring or solenoid is faulty. You can get replacement parts at home depot or ace hardware.
You may have a condition where your wiring shorts out after a rain.
You can also open the cover of your valvebox and do a visual inspection. I found last year, my valvebox was not draining and full of water. Three of the four valves worked fine under water but the fourth would not. I replaced the valve and fixed the drainage issue.
Any cheap voltmeter or tester will do.
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