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

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Garage door opens by itself. Maybe neighbor has same code?

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This is generally caused by a bad wall control or the wiring going to it. Make sure there are no staples cutting through the insulation. You can temporarily remove both of these possibilities by removing the wire at terminal #1 on the rear of the motor unit. You can then hook that wire back up and remove one of the wires from the back of the wall control.

Posted on Jan 03, 2011

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Garage door opens by itself mostly at night.


Sounds like someone nearby has the same opener. Change your code.

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Sounds like one of your neighbors may have recently replaced their own garage door opener and it coincidentally operates in the same frequency band as yours. One of them may also have purchased a new car and recently programmed it to open their door, but it inadvertantly interferes with yours. Depending on the quality of your door opener's receiver and how old it is, some receivers are not as good as others in their ability to discriminate against similar transmitted codes in the same frequency band. When the door opens by itself immediately go outside and see if a neighbor's door has just been opened (or closed) at the same time. Does your door open by itself at similar times during day? Like when a neighbor might be leaving or returning home from work? When someone uses a remote to close their garage door when leaving home, they (and the remote) are usually located in their driveway, but when they use it to open the door upon arriving home, they might be located right in front of your house.

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We just installed a cratsman garage door opener yesterday. Today, our neighbors opener is also opening our door. What can we do to fix this?


Inside the remote as will as on the opener you will see small "dip" switches. These set the code for your garage door opener. The both (on the remote and the opener) switches need to match each other.
The reason this is happening because many people just leave the "default" code from the factory, and well....you see the results.

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Mar 09, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Neighbor opening our garage door


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,
and never had to repair this type of fault as the supplier or manufactuer has always assisted with their products thru warantee or advice,

I have 20 years of experience in the industy in NZ,Thanks MISTERDJ

Jun 12, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door opened by neighbor


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.

Jun 11, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

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yes. Press the learn button for 8 seconds to clear the remote memory. Reprogram all remotes and keypad

Feb 23, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door opens


Do you have the option to change the electronic codes on your garage door opener system? My father-in-law had the same problem a number of years ago. He had not reset the code (equivalent to the combination on a lock) from the equivalent of 0-0-0 (which his unit shipped with). Turned out that a neighbor (or neighbour - in Canada) had the same /similar unit and when the neighbor opened 'his' door, my father-in-law's door would also open. You don't have to see the person drive by - it can be the neighbors behind you as well. You may find a solution by determining if you can change the original electronic code to a different one of your own choosing.
Hope this helps.

Dec 31, 2007 | Sears Craftsman LiftMaster Chamberlain...

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