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

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Sears Craftsman 1/2 HP garage door goes all the way down, then back up. The lights do not blink. Checked for obstructions, none. Nothing blocking the sensors. What can I do to fix this?

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If the door is hitting the floor and then reversing you need to adjust the 'down limit' which is on the side of the motor unit. Turn it a bit in the opposite direction of the arrow printed on the cover. Some tweaking may be necessary.

Posted on Oct 08, 2009

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if the stops are not wrong.
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you did not give enough info. If it closes completely and right away goes up, if bulb blinking. if it is, something on door is blocking safety beam. If light is not blinking, DECREASE down travel.

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