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

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Door Hums but won't open

You addressed a similar problem earlier. Symptom: hit the remote and the door motor hums for a second, light flashes 5 times repeatedly. Called my regular serviceguys and they said its likely a lightning surge requiring a new circuitboard. Actually have same problem with 2 doors, one happening 2 days after the other. In both cases the chainstop ran into the checkbolt and got a little lodged. I freed it but, still have the problem. Still recommend replacing gear drives?

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Drive gears not causing this problem. usually when trolley lodges against bolt, you take out bolt, reset up travel a little, put bolt back in and it never happens again.

Posted on Jan 15, 2009

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If it just hums and not actually run. Then the trolley is jammed against one of the stop bolts.

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1 Answer

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1 Answer

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