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

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Garage door opener will not close in cold weather

My Craftsman garage door opener will open in cold weather, but when I push the button to bring it down, it moves about 6 inches and then reverses and flashes like there is an obstruction. Only happens when temperature gets in the 20's or lower. When warmer, no problem. Have checked track and cannot find anything. Thanks.

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  • ghomeghome Jan 24, 2009

    Mine does the same thing. In the cold it moves an inch or two and then goes back up and the light flashes as if there were a blockage. It only happens in cold weather. This is my second winter with this door and it did it all last year also.

  • wsburnette Jan 27, 2009

    Have already tried all adjustments. Unit has been operating for 10+ years without a problem until this year. Beginning to think it is a sensor malfunction. Door will close if you hold the wall unit button down.

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The are two knobs on the back of the opener. They are force settings. One is the upforce and the other is downforce. Turn both knobs to "5" and try. This should take care of the problem. They come from the factory at 1 or 2 and when it gets cold it takes a little more force to cloce the door.

Posted on Jan 26, 2009

  • Vince Heuser Jan 27, 2009

    If door will close holing down wall button. It is definatly the safety eyes. Holding the wall button down overrides the safety eyes. Check the lights on safety eyes. If one light is on there is an alignment issue. If no lights are on there is a power issue. Check all wires and connections. If one light is on and the other will not come on with alignment, the safety eyes need to be replaced.

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