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

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Garage door opens randomly at anytime. Opened sometime in the middle of the night and I find it about 5 AM the next morning.There are times when you close it, and then it opens again after completly closing when using the wall control panel. Any suggestions.

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This sometimes happens when the door is traveling just a bit too far downward, hits the floor and the safety causes it to reverse and open. Locate the 'down limit' on the side of the motor unit and turn it just a little in the opposite direction of the arrow printed on the cover. Some tweaking may be necessary to get it just right.

Posted on Sep 08, 2010

  • sckd Sep 11, 2010

    We have the same problem with our garage door but don't feel the solution 1 is it as the door will have been down for 3 hours and then it will go up by itself. We go back and put it down, it is down for an hour or more, and goes back up.

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Make sure it isn't the wiring to the wall console by removing the connection at terminal #1 on the end of the motor unit. Staples used in installation can cut through the insulation and cause this problem.

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There may be an electronic short in either the wall control button or the receiver logic board. In this case, remove the wall control wires from terminals 1 and 2 on the motor unit. Should the symptoms persist after the wires are removed, replace the receiver logic board. If the symptoms stop with the wall control wires removed from the motor unit, replace the wall control button or the wires leading to the wall control button.

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If you are referring to the LED on the back of the motor unit flashing 4 times, that is the code for door sensors misaligned. Check to make sure the small light on each sensor is lit and not flickering ever so slightly. The flickering is sometimes very hard to see but it will cause the problem you are describing.

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Changing the code on your keypad wouldn't cause this problem. It is most likely a bad wall control or the wiring going to it. You can eliminate both possibilities by removing the wire from terminal #1 on the rear of the motor unit. I would do that for a night or two just to see. You can then go further to eliminate the wiring or the wall control. If you replace the wire on terminal #1 and then remove the wires from the back of the wall control you will see if it is the wiring. The staples used during installation sometimes cuts through the insulation and cause this problem. The wall control just goes bad.

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Unfortunately storms do bad things so door openers sometimes. It has most likely gotten to your logic board. You can remove that board and look for burnt or missing traces of the print. Random flashing of that LED is normal.

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