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

2 Answers

Craftsman 1/2 HP door opener bounces back open

My garage door (not always, but often) closes and a second or two later opens again. This may happen a few times in a row. I have to stop it, close it, stop it...

Other times it just closes properly. Any Ideas?

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  • Anonymous Oct 05, 2008

    Mine does the same thing ! I tried disconnecting the sensors but it still does the same.

    One sensors green light doesnt work so I assume the sensor is bad.

  • wozzie Oct 07, 2008

    My garage door opener will not open or close all the way. I have to keep pressing the button many times just to get it to move in either direction,it just stops and sometimes goes in the other direction. It also only open 1/4 or 1/2 way never opens all the way.

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Inside your housing there is a plastic threaded screw w a metal t. This screw rotates the door will continue to move til this t hits a metal sensor. There are 2 adjustment screws on the side of the housing. One for up and one for down. Try turning the down sensor to the right ( I believe if not check there is a pic next to the screw) a 1/2 turn or so. Keep making small adjustments til the door stops in the proper spot.

Posted on Sep 13, 2009

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Hello,

There should be 2 sensors on the bottom of your door on the inside, 1 on the right side and 1 on the left side.
These sensors serve 1 purpose to send a beam or reflection to each other.
If something is blocking this reflection or is in front of the sensor the door will always come back up.
It is a safety feature so nothing or no one gets hurt when the door is closing!

Posted on Sep 23, 2008

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Posted on Jan 02, 2017

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