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

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I have a Craftsman 1/2 HP chain drive garage door opener.

My door goes up and does not want to stop. I have played with the adjustments but it does not want to reverse and go back down.

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You need to take the cover off the motor unit and watch how the limit switch assembly works. If the door is not stopping when the contacts make then you have a bad logic board.

Posted on Jun 15, 2009

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Don't know Mod. No. lost installation manual, approx. 5 yrs. old Need installation manual.


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    [PDF]GARAGE DOOR OPENER Model 3265 1/2 HP ... - LiftMaster

    www.liftmaster.com/.../en.../tucmanuals/114a3044.pdf Chamberlain GroupFasten the manual near the garage door after installation. .... This garage door openerhas been designed and tested to offer safe service provided it is installed, ...

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    Craftsman 1/2 HP Chain Drive Garage Door Opener - Sears

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    Craftsman1/2 hp Chain Drive Garage Door Opener Opens by Remote, Inside and from Car Enjoy a great end to every day by ... Owners manual - English (Warranty).

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About 496,000 results (0.43 seconds) Search Results

    [PDF]GARAGE DOOR OPENER Model 3265 1/2 HP ... - LiftMaster

    www.liftmaster.com/.../en.../tucmanuals/114a3044.pdf Chamberlain GroupFasten the manual near the garage door after installation. .... This garage door openerhas been designed and tested to offer safe service provided it is installed, ...

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    CraftsmanCraftsman has the best selection of Garage Door Openers in stock. Get the Garage Door Openers you want from the brands you love today at Craftsman.

    Craftsman 1/2 HP Chain Drive Garage Door Opener - Sears

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IT JUST STARTED TO ACT UP. i WILL START TO GO UP 1 FT AND STOP AND YOU PUSH THE BUTTON AGAIN AND IT GOES DOWN. tHEN YOU TRY AGAIN, SOMETIMES 2-3 TIMES.


Un-hook the chain from the door, and see how hard it is to raise the door. It should be easy, not hard. If it's hard to open by hand, the opener won't do it, and will stop. You can adjust the springs to counterbalance the door so it's easy for the motor to lift it. You may need new springs.

Oct 21, 2015 | Craftsman 1/2 HP CHain Drive Garage Door...

1 Answer

Garage door moves few inches and stops, springs are fine, sensros are fine.


If it is not blinking when it stops, then the capacitor is blown. Replace the capacitor and it should resolve the problem.

Aug 09, 2014 | Craftsman Garage Door Opener 1/2 HP Chain...

2 Answers

My older Craftsman garage door opener comes down about 6" & then goes back up. I just replaced all the rollers o& the opener worked fine. Then I tightened the chain on the opener & it worked ok...


If the main light flashes 10 times when the door goes back up it is a door sensor problem. You chain should sag just a little. If you tighten it too much it will click as it goes over the sprocket. You can increase the down force which is an adjustment near where all those white wires go. A 1/4 turn should be enough. Release the door from the opener and operate it by hand. It should move freely and when you have the door approximately waist high it should stay put. Neither raising nor closing.

Jan 11, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door doesn't open and close properly


Loosen the chain enough so that you can remove it from the sprocket above the motor unit. With the door closed run the motor until the sprocket turns clockwise and stops. With everything attached replace and tighten the chain. Some adjusting of the up and down limits will probably be required.


Jan 07, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

My craftsman 1/2 hp garage door starts to close and then opens up


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....

Jul 19, 2009 | Sears Craftsman LiftMaster Chamberlain...

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