Some devices have a reset button on them, often not large so it is not pushed by accident. Some are even recessed in a hole, but if that is the case it should be marked right by the hole. Do you have an instruction sheet for the remote ? With Model # and Make oftten instructions can be looked up on the internet. Usually at the factory site. Possible the problem is the programing on the remote accidentally was changed. In my case it could have been the button pushing grandson.