Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+
I have the same problem. When I push the remote or wall switch, the main unit buzzes twice but nothing happens. A month ago the same thing happened to my other opener, and after some inspection of the gears inside, and the track/chain system (all was free to move easuily, and showed little wear), and after pulling the red rope to release the door/load completely from the main unit, I gave in and replaced the whole system. So, since this is the second time in a month that this has happened (same symptom, different opener - other one was a Craftsman also made by Chamberlain), I'm determined to get to the bottom of it. I'm suspiscious of the motor-starter, but haven't investigated yet. CAUTION: The motor starter capacitor is charged up and ready to strike, even when power is off, so don't touch it!
My Liftmaster opens and closes fine, but every 15 seconds or so the main unit (motor) beeps whether the door is open or closed.
Posted on Jul 18, 2009
I would replace the capacitor.
Posted on Jul 14, 2009
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Posted on Jan 02, 2017
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May 18, 2016 | Building Materials
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to see if the trolley is jammed against the bolt just in front of the
motor unit. If so loosen the chain enough to remove the tension of
the trolley. Now run the motor until the door closes. While the door
is closed, locate the 'up limit' control on the side of the motor
unit. Turn this control 2 full turns in the opposite direction of the
arrow printed on the cover. Tighten the chain.
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