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

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Door closes to fast and sometimes re-opens by itself

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A couple possibilities here. Make sure the door spring isn't broken. Your door is traveling too far in the down direction and when it hits the floor the safety sensor reverses it to the open position. The down limit adjustment is on the side of the motor unit.

Posted on Jul 06, 2010


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