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

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Door will only open one foot.One sensor light is green and one is yellow.We have had a recent power outage.Thanks

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Check your door springs. Most likely one is broken. If not remove the cover from the motor unit and check the drive gear. It is a white nylon gear and is just in front of the motor unit. It may be starting to go bad. Should be obvious if it is.

Posted on Dec 11, 2009

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Hello!WE had recent power outage ,now door opener won't work.unit has power lights come on when remote pad pressed,but nodoor action?thank you


Along with the power outage you probably also had a power surge. You need to pull the logic board and check the printed circuit board for burnt or missing traces. Unplug the unit first.

Sep 10, 2011 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

DOOR CLOSES MOST OF THE WAY AND THEN OPENS. LIGHT THEN BLINKS TEN TIMES. I NOTICED THAT ONE SAFETY SENSOR IS GREEN AND ONE IS YELLOW. PLEASE ADVISE.


Hi. The sensor with the yellow light is telling you that it is miss-aligned, Usually it only takes getting bumped to knock them out of alignment.
I would slowly turn or adjust the positioning of the sensor.
The one with the yellow light should turn green when it is all the way in line so that the beam is completing it's path.

It's out of adjustment, so the sensor is looking at it like there is an object blocking the door from closing.
It's called the obstruction sensor.
It's there as a safety feature, so that the door doesn't come down and smash anything in the opening.

I hope this helps you out.

Feb 04, 2011 | liftmaster Garage Door 1/2 Hp

1 Answer

Garage door opens w/ Power outages


You will need to get a surge protector on this unit first of all. You will have to replace the logic board and maybe the wall button or sensors depending on how bad the surge was. Any time the power goes out the logic board can be affected by it. Thanks BB

Oct 06, 2009 | General Electric GE 13-438 Overhead Garage...

1 Answer

New eye sensor not lighting up when installed


Make sure the sensors are pointed at one another. Also one of them should say "sending unit" and the other is the "receiving unit". Did you buy them new and from a dealer?

Jun 10, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

6 month old garage door will work.


On the back of the opener near where all those white wires go you will find 2 controls. One is labeled "up force." Increase this about 1/4 turn.

May 18, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door sensors out of alignment


The lights are suppost to be yellow (power to photo eyes) and green (lined up).
 1.Check to see if the door is running correctly.
  A. Run the door down and pull the emergency release. See if the door will run easily by itself.
  1. If it runs hard by hand try lubricating the rollers and hinges with silicone spray or some form of lubricant (not WD 40)
  2. If the door is heavy and falls back to the ground, you probably have a spring issue (either broken or needs more tension) in this case call a professional door repair company in your area.
  B. If the door runs fine then check the up force on your operator (the box that hangs from the ceiling). If the light bulb(s) on your operator are on the front and/or back, the force adjustment screw is on the back of the operator. If the lights are on the sides of the operator then the force adjustment screw is on the right side (looking from the back of the operator and facing the garage door). Turn the light blue adjustment screw with the up arrow to a higher number.

Jan 09, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I have a liftmaster door opener and one of the saftey sensors always has a yellow light instead of green.


That is correct and not a problem.  One light should be yellow which means power and one light should be green which means the lights are lined up. 

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

2 Answers

One sensor light is blinking green, the other sensor light is bli


the safety eyes are wired wrong on the back of the opener. Check the wire locations.

Nov 24, 2008 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Opener on wall will not work after power outage


Actually it sounds like the vacation lock has been enabled. To turn it off press and hold the lock button for 2 seconds and test it out. If this is not it then you will need to replace the logic board and get a surge protector as well. Thanks BB

Nov 11, 2008 | Sears Craftsman LiftMaster Chamberlain...

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