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

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Opens & closes arbitrarily on it's own

The door arbitrarily opens and closes (not completely) on it's own. checked the remote and the sensors. no rhym or reason.

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This is usually cause by a bad wall control or the wiring going to it. Sometimes the staples used by the installer will cut through the insulation and intermittently short the two wires together. The wall control just goes bad from use.

Posted on Jul 20, 2009

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Posted on Jan 02, 2017

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The garage Remote control was working normally at first then for now reason now it just opens the garage door but doesn't close it. I checked the side sensors they look OK & clear, and I...


It could be the garage door motor that is acting up. Try closing it with the button in the garage. If that's not the case, you may need a different garage door opener.

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My mom & I each have a Craftsman garage door opener at our respective homes & live @ 15 minutes apart. Our openers are about 13 to 14 yrs old. The past two yrs. we've both had the same problem. ...


If the main light flashes 10 times when the door reverses to the open position it is a door sensor problem. Make sure both lights on the sensors stay on and don't flicker while the door is moving and the sensors are firmly attached so they don't move. Tweak them just a bit.

Nov 09, 2010 | Sears Craftsman LiftMaster Chamberlain...

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Check to make sure the door sensors are pointed at one another and the small light on each one is lit and not flickering. If you cannot get both lights to come on then your sensors have failed.

Jul 13, 2010 | Sears Craftsman LiftMaster Chamberlain...

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Craftsman # 139.53879 -1/2 h.p. Door opener- problem re-programing remote unit. Garage door will open but not close using remote. Wall switch works fine to open & close.


Check your door sensors. They must be pointed directly at one another and the small light on each one must be lit and not flickering. If by tweaking them you can't get both lights to come on you may have a wiring problem or one of the sensors has quit working.

Apr 14, 2010 | Sears Craftsman LiftMaster Chamberlain...

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Garage door opener won't close, light on unit flashes


Easy problem - and easy (temp) solution.
The safety pet sensors are blocked or broken
Press the button in the garage and hold it until the door is completely closed.....this over rides the safety sensor at the base of the garage door.
You cannot over ride the sensor with the wireless remote.
Check to be sure that the sensors are pointing at one another.
If they are, check the wires.
If good, the sensors have gone bad. Order replacements.

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Door will not open or close with remote


What does a normal remote do with the lights?
Is yellow and green normal?

Aug 03, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Mine does the same thing...


If the main light is flashing 10 times you have a door sensor problem. Might be the wiring to the sensors. Nothing else will cause this flashing of the main light.

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

1 Answer

Chamberplain Garage Door Opener problem


IF U HAVE TWO EYE,SENSORS ON EACH SIDE OF THE DOOR SEE IF SOMETHING IS BLOCKING THE EYES OR SOETHING IS COVERING THEM, OR THEY ARE OUT OF ALIGNMENT, ONE SHOULD SHOW GREEN, AND ONE RED EYE, GOOD LOCK

Jan 25, 2009 | Sears Craftsman LiftMaster Chamberlain...

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