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

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My Chamberlain Liftmaster garage door opener will not stay closed. It will start down and about half way it will stop and reverse itself. At times it will work properly. When the bounce happpens the light will begin to flash for about five seconds.

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Anytime the main light flashes 10 times and the door reverses to the open position it is a door sensor problem. Make sure they are pointed at one another and the small light on each one is lit and not flickering. If you cannot get both lights to come on you have bad sensors.

Posted on Oct 14, 2010

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