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

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Whenever the temperature drops below approx 40 degrees the door only opens anywhere from 12" to 3ft. The door works fine when the outside temp is above 40. When I unhook the door from the opener it moves up and down without any resistance.

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Make sure there is no grease in the rails. This can congeal and cause this problem. The 'up force' control is on the panel where all those white wires go. You can try increasing this also.

Posted on Feb 01, 2010

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