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

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On operating my remote the garage door opens but when l try to shut the door it shuts then opens straight away the only way l can stop it is to press the remote again .There is a green light that keeps flashing on the back of the liftmaster can you please help me Thank You Mrs Victoria McMurdo

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Sounds like the door is closing too far.

Try adjusting the down travel 1/4 turn at a time. When the door stays down don't adjust further (you want it to close as tight as possible and not reverse).
.
The flashing light is telling you the code, you can look it up what is causing the problem in the book.

Hope this helps

Posted on Jul 12, 2010

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It sounds like the door is traveling too far, hitting the floor and then reversing to the open position. If this is the case you need to locate the 'down limit' control on the side of the motor unit and turn it a bit in the opposite direction of the arrow printed on the cover. Some tweaking may be necessary to get it just right.

It is normal for that small green light to flash randomly. It can also assist in diagnosing some problems by flashing a code. It will flash a number of times and then pause and then repeat. If this is the case, post the number of flashes.

Posted on Jul 12, 2010

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