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

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I have a 1/2 hp liftmaster my door goes almost all the way down to about 3 inches from the floor and then stopps like it has hit something and then it will sometimes go back up other times it just freezes there

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On the side of the motor unit you will find the 'down limit' adjustment. Turn this a bit in the direction of the arrow printed on the cover. Some tweaking will most likely be necessary.

Posted on May 07, 2010

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Check the resistance down button (There is one for down and another one for up). You may need to adjust the sensitivity. That way even if for some reason the have hard time coming down, less sensitivity may solve that issue.

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If the door is hitting the floor and then reversing you need to adjust the down limit control. This control is on the side of the motor unit. Turn the control a couple turns in the opposite direction of the arrow printed on the cover. This should stop the door short of the floor. Now some tweaking of that control will most likely be necessary to get it just right. Just remember if you run the motor too much it will shut off on the thermal overload and you will have to wait as much as 15 minutes for it to cool.

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On the operator is a screw adjuster for how far down the door goes. Find this adjustment and rotate it in the direction of less travel. Then you may have to spend a few minutes setting it so the door closes snugly.

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Sounds like the down limit is out of adjustment. Turn the Down limit switch opposite the direction of the arrow a quarter turn and try again. Repeat until the door stops before hitting the floor then fine tune to shut off at the floor.

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Our door is automatically reversign itself. It goes down and pops back up.


Hi,
The adjustment is wrong...either there is something on the floor that it is hitting...frost has pushed up the floor a bit....or the adjustment is wrong up at the motor...

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Feb 22, 2011 | liftmaster Chamberlain Garage Door Opener...

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Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+: Door goes down and when it reaches the bottom, it ...


If the door hits the garage floor and then reverses to the open position you need to adjust the 'down limit' which is on the side of the motor unit. Turn this control in the opposite direction of the arrow printed on the cover. Some tweaking will probably be necessary.

May 16, 2010 | Sears Craftsman LiftMaster Chamberlain...

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You may have a bad IR sensor which is a small circuit board just in front of the motor. You might try increasing the down force which is on the rear of the motor unit near where all those white wires go.

May 04, 2010 | Sears Craftsman LiftMaster Chamberlain...

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Door closes hits the floor and reverses. It appears that the door has a sensor or something that causes the door to reverse once it hits the garage floor. What would cause this problem? The eyes are lined...


Garage doors have a setting that will do this. The door is traveling too far down and when it hits the floor, it thinks it is hitting something. There should be adustment knobs on the back of the unit to solve this. Good luck!

Nov 22, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

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IF IT HITS THE FLOOR AND GOES BACK UP. YOU NEED TO ADJUST THE DOWN LIMIT.

IF IT GOES BACK UP BEFORE HITTING THE FLOOR YOU NEED TO ADJUST THE SENSITIVITY OR THE SAFETY EYES.

TRY THE DOOR MANUALLY AND MAKE SURE IT WORKS SMOOTHLY.

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Okay...upon further inspection, my left spring has broken in two. Going to call around for some quotes to replace the spring. Thanks for the suggestions.

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