Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+
When the door reaches fully closed position it automatically begins to open again. The door won't stay closed. I've adjusted the limit sensor in both directions and it still doesn't stay closed.
If the main light flashes 10 times when the door reverses it is a door sensor problem but if the door is hitting the floor and reversing and the main light is not flashing then the door is closing too far and the safety thinks it has hit something. On the side of the motor unit you will find 2 controls. One of these is the 'down limit'. Turn this in the opposite direction of the arrow printed on the cover until the door closes but does not reverse.
Posted on Jul 17, 2009
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Posted on Jan 02, 2017
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