I installed a craftsman garage door opener a few months ago without any problems. Tonight the door cable came off pully, so I took door cables off and closed the door with opener. That apparently was a big mistake. Although the door was attached to the opener, the weight of the steel door sent it flying closed. Now the opener will not move. I press the open/close button and hear a humming sound that lasts for a couple of seconds. I removed the belt and tried again...no luck. Does anyone know what's going on. Maybe a fuse or something?
You need to remove the cover and look at the drive gear. It is probably stripped. I really recommend a technician to repair your door.
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