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

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I installed a Craftsman garage door a couple of weeks ago and all of a sudden it keeps opening by it's self. It is model #139.53918D what is causing this?

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Make sure the door isn't closing too far. This will cause it to open. Your opener comes with a warranty. Call Sears repair.

Posted on Sep 06, 2011

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Posted on Jan 02, 2017

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Craftsman Garage Opener intermittently not closing


A couple things to check and do. If the main light flashes 10 times when the door reverses to the open position it is a door sensor problem. Make sure they are pointed at one another and that the small light on each one is lit and not flickering. Tweak them a bit if necessary.

If the main light isn't flashing it may just be a simple adjustment. Locate the 'down force' adjustment on the rear of the motor unit near where all those white wires go. Increase this about 1/4 turn and try.

For the light you should unplug the unit and then using a small screwdriver pull out on the center contact in the light socket.

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