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

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

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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. 

Posted on Jan 01, 2009

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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.

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1 Answer

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Make sure it is hooked up properly. The wire with the black stripe go to terminal 3 and the solid white wire goes to terminal 2. There is always the possibility that you need new sensors.

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

1 Answer

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If the door reverses when it hits the floor it is traveling too far. Locate the 'down limit' control on the side of the motor unit and turn this in the opposite direction of the arrow printed on the cover. Some tweaking will most likely be necessary. You can always recognize a sensor problem because the main light will flash 10 times. If the main light isn't flashing it isn't a sensor problem.

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1 Answer

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it has to be aligned with its mating optical sensor on the other side of the door. try adjusting it until you get a green light.

Aug 22, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

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It means your sensors are properly aligned. Are you having a problem?

Jun 16, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door sensor light on one is green the other yellow. When they are lined up one stays yellow and one is green. When I point the yellow sensor away from the other one the green goes off. Do you think...


They are doing what they are designed to do. To work properly they must be pointed at one another and to tell when they are aligned the light on the receiving unit turns on.

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1 Answer

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what brand. you described three sensor lights/ Craftsman/Liftmaster have two, Sounds like saftey beam problem,

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