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

6 Answers

I have a Craftman Garage Door Opener Mod#139.53650SRT. It closes completely then goes back up. I replaced the sensors @ the sides of the door to no avail. I have tried to adjust the up and down on the side and rear of the motor to no avail. W could it be?

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  • 5 more comments 
  • luwaleel Oct 08, 2008

    I have a manual, have tried followed instructions to no avail. What I need is to know what is causing door to not stay closed.

  • luwaleel Oct 08, 2008

    Checked button, not sturk, working correctly!

  • luwaleel Oct 08, 2008

    The button is not stuck, the light has not worked for a year!

  • luwaleel Oct 08, 2008

    There is no keyboard and the remmote is not defective, when the door closes completely, I push the remote button and the door will stay down!

  • luwaleel Oct 08, 2008

    There is no keyboard and the remmote is not defective, when the door closes completely, I push the remote button and the door will stay down!

  • luwaleel Oct 08, 2008

    I'm an electrical tech and as such, capable of following directions. I've eleiminated the forgoing possibilities and will try the adjustment you recommend. Thanks

  • luwaleel Oct 08, 2008

    I have not yet found the solution however, I appreciate being guided through trobleshooting the thing. Thanks

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6 Answers

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I agree with the closing resistance may be set incorrectly, all openers have a safety feature that senses if something is keeping the door from closing, this is back force, you set the sensitivity at the back of the opener motor control, it is a little dial, reduce the setting just enough to stop the door from kicking back open when it closes, I had this very same problem with my craftsman and this adjustment fixed it.

Posted on Oct 08, 2008

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Check for any obstruction that is preventing the door from closing completely first..

Posted on Oct 08, 2008

  • Swilin Sampson
    Swilin Sampson Oct 08, 2008

    Found this solution on a different site:

    Garage doors have a "resistance setting" on them so that if there is
    enough resistance on the door it will stop and return to open position.
    A newer garage door has the electric eye close to the ground so that
    any obstruction will not allow the door to close and when in motion
    will return to the open position.

    Have you checked the electric eye for spider webs, or even ice forming over the eye or receiver?

    Another problem may be that it needs to have a maintenance checkup.
    Perhaps the chain and other moving parts need grease replaced. The door
    hinges also need to be greased regularly.



    Another alternative would be to "unlock" the door and manually open and
    close it during cold weather, then "relock" it. This would be better
    than continually holding the button down and forcing the motor to run.

    Hope that helps!


  • Swilin Sampson
    Swilin Sampson Oct 08, 2008

    Since you said you replaced the sensors, have you ensured that they are correctly aligned with each other?

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The opener may not realize that the door has closed all the way. You could have a malfunctioning transmitter or wall switch that could be stuck. Also when it opens back up does the garage door opener light blink.

Posted on Oct 08, 2008

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Please check the button on the mounted house controll and make sure it is not stuck depressed.

Posted on Oct 08, 2008

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Keyboard contact. Be sure that the keypad is not stucked, Open the remote and check it out or replace the unit.

Posted on Oct 08, 2008

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Do you have the instructions manual.

Posted on Oct 08, 2008

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  • mastermind10 Oct 08, 2008

    Depending on how old the opener is you should have a green light on one of the sensors that is on all the time. If you have a newer opener, this light will be orange. If you bumped the eye, then it is just out of alignment. Look to see if there is light flickering or fluttering or not on at all. To realign it simply loosen the screw attaching it to the bracket and move it until it is a solid green then retighten it. Sometimes the flickering or fluttering is so faint that you have to get on your hands and knees and look at the light.

  • mastermind10 Oct 08, 2008




    If the lights aren't on at all check for loose wires on the back of each photo eye. If you have the older style photoeyes ( rectangular in shape, two green lights and a bolt going all the way through them) they are natorious for having bad connections at the back. Otherwise make sure all the wires are connected at the opener head. One of the lights should be on all the time as long as the wiring is ok and the opner has power.

  • mastermind10 Oct 08, 2008




    Yes, It is real simple. Either you have three screws on the back of the opener or you have four plugins. Either way they are color coded. You should have two wires with a black tracer and a solid white wire. These are your photo eye wires. Then you should have a wire with a red tracer and a solid white wire, this will be your wall button. Hook the black wires up to black all the white wires up to white and red up to red.
    If your orange light is not on, then it is not getting power or it is bad. I would bet you got a loose connection somewhere though. Once you get the orange light back on fiddle with the sensors until the other one glows a solid green.

  • mastermind10 Oct 08, 2008

    try this simple option



    On the back of the motor unit you will find a control called the "down/close force". Adjust this just enough to get the door to close.

  • mastermind10 Oct 08, 2008

    Make sure about the sensors they are pointed at one another. Each of them has a small light that should be on when properly aligned.

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1 Answer

On the sensor for the craftman garage door opener 1 is orange and the other is green and my garage door doesn't open with the remotes


Nothing wrong with the sensors. They don't work when the door is opening anyway. Only when closing. Make sure the light in the wall control is not flashing. If it is press and hold the lock button for 3 seconds.

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I had a simular issue, except mine was that the previous owner decided to mess with all the settings and mounts and screwed everything up.

The problem isn't your force sensors its your downwards stopping sensor on the opposite side of the opener. For me I had to take the entire panel off and replace the sensor back in its holder, but try adjusting that sensor setting (clockwise goes down, counterclockwise goes up).

If that doesn't work then i dunno:)

Also set both force settings in between 0-1, for some reason with mine if i set it higher it would set them off....

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The blinking LED is sending the code for "RPM sensor or motor overload. It isn't the motor or it wouldn't run at all. The RPM sensor is a small printed circuit board near the front of the motor. It will be available at Sears or any good door opener service company.

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