I am just now catching up on answering some things in this thread. I hope you called us and got it resolved. Surely you did. But for the benefit of anyone reading your post, I think I can see what is wrong. Thanks for posting the video.Necroing this thread because I posted here before about the ADOR1. I've had ongoing issues with the motor acting "sticky" and draining batteries like crazy. Reading the instructions, I found that you're supposed to be able to lift the door manually without power but it was impossible to do with the motor still attached. So I ordered a new one, and now I can slide it up...But it won't lift the door on its own power. It just whirrs and tries to open, but when it's lifted it can close on its own just fine. Since the biggest reason I want the automatic door is so it will open in the morning, this isn't making me happy. Also, it has a new trick where it slams down, as seen here:
It seems simply that the set screw on the sprocket has come loose. In rare cases, the sprocket can come loose from the hub. Either case, those are very easily fixed in a few minutes. Tightening the set screw is simple but make sure you find the flat side of the shaft and rotate the sprocket so that the set screw is tight against the flat. In the case of the sprocket loose on the hub... that is a very rare thing to happen, but it also can be fixed easily by you, or I can send you a new sprocket. We have had a very few calls about this over the years and customers were always able to recrimp the sprocket on the hub themselves... A permanent fix. So again, call me and I can tell you how to fix it yourself over the phone.