First thing you need to do is check if a fuse has blown. Eklectrical problems are either real simple, or real complicated. If the fuses are OK, then you need to check to make sure there is power to the switch. If you have power, then the switch might be bad or the motor might be stuck or needs replaced. There is an access hole in the ceiling to "manually" close/open it with an allen wrench or screwdriver.