With the Craftsman 1/2 HP ....The chain is not taught and the opener bangs into the plastic light cover
If the chain is loose, The gear and sprocket is probably worn out. To solve the immediate problem. Tighten chain until it is not loose and you need to adjust the up limit. There will be 2 screws on the side with a picture of the door, one has an arrow up and one has an arrow down. The one with the up arrow needs to be turned down. Adjust until the door opens even with the top of the door opening. You will probably have to replace the gear and sprocket in the near future.
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