Once you are clear that the only problem is a slightly loose chain then you can begin fixing the problem.
Fix garage door chain loose.
Always look for loose hardware before you start checking out any other problems that might be associated with your chain drive garage door opener begin looking at the various nuts and bolts on the unit.
If in doubt replace the chain completely.
If your garage door chain needs to be replaced tightened or if you require any other garage door maintenance or repair work count on the technicians at creative door services.
This can happen whether you have a chain driver garage door opener or a belt driven garage door opener.
Sometimes extremely loose word hangs a few feet under the garage door motor rail.
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Make sure that the garage door is closed and that you have another way of getting out of the garage.
Slack will naturally develop overtime as your garage door motor wears out in particular the gear and sprocket assembly.
Step 2 turning off the power.