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

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My garage opens/close when my neighbor engages his remote control

He has a Chamberland opener, I believe it is a Sercurity+ just like mine.
Model 139.53754 with rolling codes.
My remote will not open his door. At least one time the door opened without my neighbor using his remote.
Is there a way to eliminate the rolling codes, lock in one security code?
I have cleared the remotes and reprogrammed but the light and/or the door opens when my neighbor uses his remote.
Distance to my neighbor 75'.

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Anytime a door opens and/or closes by itself I look for a smashed wire between the motor unit and the wall button.

If the wire is smashed the insulation becomes so thin that power will leak thru the insulation and activate the door.

Loosen the staples with a small screwdriver and slide the wire about ½ inch to move any areas of thin insulation away from the staples.

The second thing would be a bad wall button or a remote with a sticking button.
Or a remote in someone’s purse that gets the button pushed by other stuff in the purse.

The test is to disconnect the push button wires at the power unit. If the self operation stops you have located the problem. If you reconnect the wires and disconnect the wire at the wall button this will tell you if the problem is the wire or the button.

Do the above check just to be sure. If your unit is more thaan about 2 years old (freq. 390) you CAN buy an older non security plus remote and program it to your unit. this should eliminate the neighbors remote operating your door.

HOPE THIS HELPS

Posted on May 29, 2010

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Every time my neighbor opens and closes their garage it opens mine and closes mine, how can I change the frequency


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giving out the remotes at handover..
This is quickly fixed by re-running the setup program..
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Have your neighbor bring over his remote and open or close your door with it. Then hold the smart/learn button in for 6 seconds on your opener. Then see if he can open your door. He shouldn't be able to because that procedure erases the memory in your opener. No remotes should work. You need to get that remote #53778 back and program it and then see if your neighbor can open your door. If he can open your door at any point after you have held that button in for 6 seconds you need to get a new door opener.

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Look at the LED light next to the SMART/LEARN button on rear of the motor unit. You may need to remove a light lens cover in order to see it. If the light is flashing rapidly this means you have a stuck button on one of your remote controls. Take the batteries out of each remote control. When you remove the batteries from the bad remote, the light will stop flashing. This remote needs to be replaced.


If one of your neighbors remote controls is inadvertently programmed into your receiver, you door will open when their remote is activated. If this happens you will need to clear out your receiver and reprogram your remote controls. Press and hold the smart/learn button for 6 seconds or until you see the small LED light near the button turn itself off. If the above steps have been followed and the symptoms continue, 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, and the wires leading to the wall control button.

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You say you "setup the remote and the main box but doesn't solve." I think you mean you programmed the unit but I'm not sure. Anyway try holding the smart/learn button in for 10 seconds and this will erase the memory. None of the remotes should work. Now when you are sure the neighbor will not be using their opener, program your remotes. This may be what you did but I'm not sure.

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I have a feeling your neighbor operated their door opener when you were programming your new clicker. Try erasing the memory of your opener and then program the clicker again making sure your neighbors do not operate theirs at the same time. To erase the memory hold the smart/learn button in for 10 seconds.

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Report this problem to the Manufactuer stating your model number of controller and remotes too and they may help solve your problem faster than getting offside with your neighbour,apart from that the remotes and motor controller may need replacing to give you more security and control over your own secure enviroment,

I have fitted many security devices,alarm panels,cameras,sensors,keypads,etc,
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Have you seen the neighbor open your door? The reason I ask is because it is almost impossible. The most common cause of a door opening by itself is a bad wall control or the wiring leading to it. You can temporarily eliminate both possibilities by removing the wire from terminal 1 at the rear of the motor unit. Do this and ask your neighbor to bring over his remote and try it on your opener.

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