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

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My Champion garage door opener opens by itself and the light does not come on

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Look at the LED light next to the SMART/LEARN button on rear of the motor unit. You may need to remove a light lens cover in order to see it. If the light is flashing rapidly this means you have a stuck button on one of your remote controls. Take the batteries out of each remote control. When you remove the batteries from the bad remote, the light will stop flashing. This remote needs to be replaced.

If one of your neighbors remote controls is inadvertently programmed into your receiver, you door will open when their remote is activated. If this happens you will need to clear out your receiver and reprogram your remote controls. Press and hold the smart/learn button for 6 seconds or until you see the small LED light near the button turn itself off. If the above steps have been followed and the symptoms continue, there may be an electronic short in either the wall control button or the receiver logic board. In this case, remove the wall control wires from terminals 1 and 2 on the motor unit. Should the symptoms persist after the wires are removed, replace the receiver logic board. If the symptoms stop with the wall control wires removed from the motor unit, replace the wall control button, and the wires leading to the wall control button.

Posted on May 12, 2010

  • Don Maggard May 13, 2010

    Here is some additional info.

    In most cases, when a garage
    door opens or closes by itself, or when you find your door open, upon
    returning home, the problem is due to a short somewhere. This short
    is most likely to be in one of two places: either in one of your
    transmitters or in the wall button or its wiring.

    When there is a short in your garage door transmitter, you will
    often find the garage door is up upon returning home, even though you
    know you closed the door when you left the house. A short in your
    transmitter causes a continues signal to be sent. As you are pulling
    out of the driveway the garage door closes fully and appears to stop,
    but as the carriage and arm run past the down limit and hits the
    header bracket it reverses, and the door begins to open, just as you
    start driving off down the road. You come home to find the garage
    door is up, as if someone else had opened your door. The best thing
    to do to troubleshoot the garage door problem is remove the batteries
    from your transmitters and try operating the door from the wall
    button. If the problem is intermittent, you may want to do this for a
    day or two to eliminate the transmitters as the culprit.

    If the problem persists, try removing the wall button wire at the
    motor head to ensure it is not a short in the wire to the button,
    then try operating the garage door with the transmitters only. If it
    stops the problem, replace the wires and test the wall button. It is
    a process of elimination.



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