Go here, and under the Controllers section, click on the ICC, there is your owners manual
http://www.hunterindustries.com/Resources/PDFs/pdf_english_manual.html
That being said, I make sure the water main is on to your sprinkler system, and make sure if you have a backflow device, those valves are open as well. With water flowing, if the system still doesn't operate, I would probably consider calling in a contractor to further diagnose the system.
Tony Posey
Ridge Run Landscapes