Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+
When the pushbuttom is pressed, the garage door goes down, but comes right back up. Nothing is obstructing it from the bottom.
In other words, the door will stay open when pushbutton is pressed
but will not stay closed when pushbutton is pressed.
You need to check the adjustment for the travel of the door ... All automatic closers have a built in safety mechanism that prevents children, pets and even yourself from being crushed by the door ... so if the travel is set to low the door will hit the ground too hard and safety mechanism will activate opening the door again! Look at you documentation for how to adjust this for your particular model :)
Posted on Sep 29, 2009
If the main light is flashing 10 times it is a door sensor problem and most likely need to be aligned. They must be pointed at one another to work properly. If it is hitting the floor and reversing and the main light is not flashing then you need to adjust the 'down limit'. This is on the side of the motor unit and you need to turn it in the opposite direction of the arrow printed on the cover. Some tweaking will most likely be needed.
Posted on Sep 29, 2009
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Posted on Jan 02, 2017
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