Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+

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Liftmaster 1/3 HP - humming, but does not open.

Door worked fine 1 hour prior to door not working. no storm, no electrical problems. overhead unit gets power - light comes on. Press either remote or wall remote and unit clicks, then hums for about a second or two, then stops humming. Door is not jammed - works fine when released. Motor turns freely when manually turned (so it's not locked up). Circuit board problem or transformer? any ideas?

thanks

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  • Lockyboy Oct 20, 2008

    I have same problem. It happened once before and we had it serviced. Guy was here for 10 minutes and fixed it easily -- according to my wife who was home. Hate to spend another $75 for 10 minutes of time.

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It's the gear drive. There are kits online for about $40, if you're semi-handy you can replace it yourself. Search for liftmaster replacement parts.

Posted on Dec 16, 2008

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