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

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Garage door opens

I have had my garage door open on its own with no one activating the remote or the wall mounted opener. What can cause this?

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Re: 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.

Posted on Jan 04, 2008

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Why door is opening without being activated by remote opener or inside garage opener;something is activating the open/close command;ther is nobody around or a neighbour that may interfere with his doo

I had a similar problem. I discovered the illuminated door bell switch I used as the inside door control would activate whenever the wall on which it was mounted had a heavy vibration from door slamming or thunder. Could this be your problem too?

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My panel in garage blinks on and off and I cannot open the garage door from my car

Most of the time, that means someone has accidentally activated the Remote Lock Out feature on the inside wall mounted door opener switch. Check your Owners Manual for instructions on how to deactivate this.

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Garage door will not open close with remote

Press and hold for 3 seconds the button on the wall control with the lock icon.

Aug 29, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door wont work with remote

If the small light in your wall control is blinking it is in the lock mode. Press and hold for 3 seconds the button with the icon of a lock. This will toggle the lock function off.

Aug 04, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

My keypad works,my remote opener does not, even

It is related. One of the buttons on your wall control is the lock button and has a lock icon on it. Press and hold it for 3 seconds. The blinking should stop and your remote should now work.

Aug 01, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Sear garage door wall mount contol light keeps blinking

Hold the button with the lock icon in for 3 seconds. This should toggle the unit off vacation mode and your remotes will work.

May 31, 2009 | Sears Craftsman LiftMaster Chamberlain...

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Make sure the code set inside the remote is the same as in the main reciving unit code.

Dec 06, 2008 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Remote only closes the garage door, will not open it

Anytime a door opens and/or closes randomly or doesn’t work consistently 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 or interfere with the remote signal.

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 / interference 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.

In your case the expansion of the wall in the afternoon may be enough to cause pressure on the wire to increase the problem – works in the morning but not the afternoon.

Also after you change the batteries you need to reprogram the remotes.


Aug 08, 2008 | Sears Craftsman LiftMaster Chamberlain...

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