My Craftman 1/2 hp opener is only 4 years old and this is the second winter in a row that the opener failed to open or close the door. It makes a buz and then nothing happens from either of two remotes or the wall console. I tightened the chain and wonder of wonders, it began working again only to conk out in a couple of weeks, on the very next near freezing day. Now, my sensors are not working. One light bulb in the opener comes on when infrequently and I am at my wits end.
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