First of all, you want to make sure the obivious is taken care of. Is your main water supply shut off valve open? If so, do you have a backflow device, and if you do, are those valves opened as well? If you are positive you have water flowing out to your valves, try opening your valves manually. Do your sprinklers turn on when you open the valves manually? Is there a Master Valve for your system? You should be able to look at the wiring terminal on your controller and there will be a terminal marked MV, for master valve, if there is a wire connected to it, you probably have a master valve. Make sure it functions properly as well. Try troubleshooting these areas first. If all of your water supply valves are open, and still no luck, call back the company that winterized it. They can probably give you some pointers as to what to turn on for a proper start-up.
Tony Posey
Ridge Run Landscapes