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

1 Answer

Garage Door opened but will not close. I opened

The garage door to move out some furniture. When I pushed the garage button on the wall to close, I just hear a short humming sound. The door does not move. I released and manually closed the door. When I push the wall button, there is no movement of the chain just the hum sound. I have reset the power at the fuse box but since the lights and hum sound I assume it is getting power. My wall has 3 buttons that include a Light, Lock, and Open Close. I have tried with no luck pushing the Lock button thinking somehow I inadvertently locked the unit. The garage door is a Craftsman 41A4315-6A. Any suggestions? Thanks in advance.

Posted by psaul on

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Don Maggard

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I think the trolley has jammed against the bolt just in front of the motor unit. Remove the bolt and then run the door until it is closed. With the door closed locate the 'up limit' control on the side of the motor unit. Turn this 2 turns in the opposite direction of the arrow printed on the cover. Replace the bolt.

Posted on Sep 01, 2009

  • aakk611 Nov 03, 2010

    how can you remove the bolt when the trolley is totally jammed into it. the question is how can youmove the trolley away from the bolt just a little so a wrench will fit in there to remove the bolt

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If the wire is smashed the insulation becomes so thin that power will leak thru the insulation and activate the door or interfere with the remote.

Loosen the staples with a small screwdriver and slide the wire about ½ inch to move any areas of thin insulation away from the staples.

The second thing would be a bad wall button or a remote with a sticking button.
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The test is to disconnect the push button wires at the power unit. If the self operation / interference stops you have located the problem. If you reconnect the wires and disconnect the wire at the wall button this will tell you if the problem is the wire or the button.

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