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

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Our Master Mechanic model 601MM garage door opener goes up about 8" and down 6" when you go to open it. I have checked the safety and they both have the green light and if you hit the button and put your hand over the stop area it will stop it. What could it be thats making it just go that little bit and come back down. I have unhocked the door and it doesn't make any difference

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I WOULD CHECK THE RPM SENSOR

IF IT IS BAD OR THE CUP HAS MOVED OUT OF THE SENSOR YOU WILL GET THE EXACT SYMPTOM YOU DESCRIBE.

Posted on May 31, 2010

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Posted on Jan 02, 2017

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