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

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

One of my garage door sensor led lights is yellow while the other is green what does this mean?

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

Posted on Jun 16, 2009

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My garage door opener is a 3/4 craftsman and one light is yellow and the other is green. I put my hand in front of the green light and the green light went off. the other side is a yellow light and it


Hi Vickie,

The safety beam portion of the garage door opener is set up to stop the door from closing if something (car, person, etc,.) is in the doorway.

When the door is open - if you press the hard wired push button (not the wireless remote) the door will either close until shut completely, or begin to close and reverse direction as soon as you let go of the button. When this happens, it *usually* means that a sensor is blocked - and reversing the door motor. If you try yhtis with the remote the door may not move at all or just bump down and stop.

You should re-align the sensors as described in the link below. Good luck!


How to Replace the Safety Sensor for Garage Door Opener Repair Guide Help...

How to Adjust Photo Eye on Garage Door

Nov 03, 2014 | Craftsman Professional 3/4 hp Hydro-Glass...

1 Answer

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...

1 Answer

What makes the sensor light turn yellow


On my garage door opener, the light is amber if 1) the units are not in alignment, 2) something is blocking the light path, 3) a wire is broken to one of the sensors or 4) a sensor is damaged. When both lights are working, then both units have green LEDs.

First check if anything is in the doorway. Next look at the sensors and make sure that they are parallel to the floor and the doorway and in a line with each other. (We sometimes accidentally kick the sensor when walking out of the garage past the car.) Finally trace your wires and try to determine if there is a break in them. Sometimes a staple breaks the insulation; other times, the damage may be caused by rodents. You will need to replace the entire wiring between the sensor and the opener. This is two-conductor wire. Make sure to pay attention to the polarity of the wires (or match the current colors (red/black or white, white/black)). The final option is to replace the sensors (they are always sold in pairs).

Note: there are some models with an amber LED on one sensor and a green LED on the other. In that case, the unit is working properly. Please provide a model number of the opener (not just the keypad) for additional help.

I hope this helps.

Cindy Wells

Dec 04, 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

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?


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.

Jul 30, 2009 | Sears Craftsman LiftMaster Chamberlain...

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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...

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