About a month ago I installed a ¾ hp Sears Craftsman chain drive garage door
opener to replace an older unit that gave out. The opener works fine, but
yesterday I noticed a rather loud constant humming noise coming from the
opener unit. I have tried disconnecting the door to make sure there was no
strain on the unit but that did not help. I tried unplugging the opener and
plugging it bank in but that also did not help. If the opener has been
unplugged for a while, the humming noise does not start immediately when it
is plugged in again. It generally takes 10 to 15 minutes as if something has
to warm up. I have had several garage door openers over the years but have
never had one make a noise like this. Any thoughts?
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