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Make sure that the transformer is supplying the 26 volts ac required by the pump relay and zone solenoids. If the voltage is there and unit still will not operate then the electronics are to blame.
Most sprinkler valves run on electricity from the timer. If the time doesn't send electricity out, the valves don't open. If an animal has chewed through a wire, that valve won't open.
You can take a meter and check the voltage on the wire at the timer. If nothing, replace timer.
If you get correct voltage at timer, measure at valve. if voltage good there, replace valve.
Normally, when there is a battery for an item that has a cord that plugs into power, it is to keep "Memory" of anything programmed, in case power goes out.
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