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

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Craftsman 1/2 HP Starts AND Stops Going Up or Down

My Craftsman 1/2 HP (about 7 years old ) is giving me a fit. Sometimes it will open & close fine but about 80% of the time it will start to go up then stop. It will do the same thing going down. You have to keep pressing the button to finally get it to open or close. Does this with wall button, remotes, and outside key pad. I have a drop light plugged into the other outlet where the unit is plugged into and the drop light stays on so i am not loosing power. LED lights on the safety beams seem fine. Could the safety beam be damaged, is there a way to by-pass them it see if that is it ?
Any ideas ??

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  • Ralph Esposito Feb 01, 2009

    Ok, I adjusted the Force screws to the MAX (yes I have the manual) I don't think that it will help as I had adjusted them half way before and it still did the same, I will see how the Max setting works. If it still does the same problem jump the safety beams correct ? Which one is the receiver ? and do I just twist the two wires together that go to the receiver beam only?

  • Ralph Esposito Feb 01, 2009

    OK jump the terminals on the power head where the safety beams hook up, will give it a try, Adjusting the force screws did not help.

  • Ralph Esposito Feb 02, 2009

    I found a poor connection at the power head where the receiver sensor wire connects , I doubled up the wire and it seems to work fine now.
    Thanks for the help.


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With the age of the door, chances are it just doesn't move as easily as it once did causing the built in limiters to stop the door. the limiters are designed to stop the door from crushing something or someone if the safety beams fail and there is an obstruction in the path of the door. Some units allow you to raise (increase) the force used to move the door. Most times the adjustment screws are hidden either behind the light lens or behind a removable panel. The limiter screws are NOT the screws used to adjust the travel of the door. If you don't have the manual for the opener, you may be able to download one to assist in locating the correct screws if the opener has this adjustment. As far as by-passing the safety beams, just place a jumper wire in place of the safety beam receiver.

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Posted on Feb 01, 2009

  • clarkco2002 Feb 01, 2009

    The manual and/or the unit should indicate which screws are transmitter, and which screws are receiver if separate sets are used, if only two screws are used for the safety beams, simply place a jumper between them.


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