If a garage door's not working properly, there’s no need to panic because it's could be easy to deal with. First thing to do would be, to check whether the power source has been disrupted. If it doesn't close all the way, check the door if it's working when you manually raise and lower it. If the garage door reverses immediately after hitting the floor, the close force just probably needs adjusting. Lastly, if the garage door opens, but the motor won’t stop running, the limit switch probably needs to be moved away from the motor unit. I hope that helps. If there's anything else, just state another question. :)