Garage door won't close
I need some help with my garage door opener. It started couple of days ago after the a hard day of rain and thunder (I think it may have something to do with it). My 1/2 hp Craftsman 139xxx will not close! From the open position, when I press the remote or wall control it will slide down all the way to the ground but then slide back up again. It will not stay close as it used to be. I have checked and increase the down limit and the down force but it still slide back up. My safey sensors are well lid on both. I have noticed there is a tiny orange light in the back that lights up every few seconds which I don't think occurs before. If anybody have any ideas please help! Thanks..