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

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Left Sensor has yellow led & right sensor is green. Garage closes and then immediately opens. I'm assuming it's the sensor with the yellow led. How do I fix this?

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If the main light flashes 10 times when the door reverses it is a sensor problem. Make sure the door isn't hitting the floor and then reversing. This problem will not cause the light to flash 10 times and can be corrected by adjusting the 'down limit' which is on the side of the motor unit.

Posted on Jul 30, 2009

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Chamberlain troubleshooting


Check to see if sensors (eye) on sides of door are lined up, they need to be looking directly at each other. If that doesn't work change sensors, simple, install, hook up 2 wires per sensor, wire with line to same wire, blank wire to same blank wire and align so sensors see each other.

Jul 29, 2014 | Sears Craftsman LiftMaster Chamberlain...

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When I try to open the door, the garage door will only open approximately 4 inches. Then when I try to close the door, the door closes...then opens to the 4 inch mark and remains here. The 'right' side...


Sounds like a door problem not an opener problem. Pull the emergency release on the opener and make sure the door itself is operating correctly. Soulds like the assist on the door needs adjusted.

Feb 20, 2011 | Garden

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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.

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

1 Answer

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If the main light is flashing 10 times it is a door sensor problem. Make sure they are pointed at one another and neither of the lights is flickering.

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

1 Answer

One of the trip sensors shows a yellow LED, the other sensor shows a green LED. The door will not go down unless the close button is held. A force down adjustment does not help. Even when disconnected from...


If when the door reverses the main light flashes 10 times it is a sensor problem. If not it could be the RPM sensor board which is a small printed circuit board just in front of the motor.

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

1 Answer

One of my garage door sensors is yellow while the other is green.


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

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

1 Answer

Liftmaster 1/2 - Will not close


What usually happens is a sensor gets bumped so that they no longer are pointed at one another. They must be for the light on the second sensor to come on. Tweak them and see if you can get the light to come on. If you can't you either have bad wiring going to that sensor or the sensor itself has quit working.

Jun 15, 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...

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