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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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.

If you need further help, reach me via phone at

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


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...

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.

Jun 07, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door will inconsistenly not close

It is normal for that LED by the learn button to flash randomly. It can also flash a code to help with diagnosis. The codes are 1 to 6 flashes followed by a pause and then repeats. A rapid flash is a sign it is receiving a radio signal but not necessarily the correct one to operate the door. If when your door doesn't close properly the main light flashes 10 times and the door reverses to the open position it is a door sensor problem. The sensor must be pointed at one another and sometimes can be off just a hair and will cause intermittent problems. A slight tweaking of the sensors will cure this problem. The 'down force' adjustment can be set too low and cause the door not to close sometimes. This can be increased to overcome this problem. This problem will not cause the main light to flash. The other possibility is the RPM sensor. This is the printed circuit board that senses when the door runs into something. I have never seen one intermittent but that doesn't mean it's not possible. I hope this helps you.

Mar 19, 2009 | Sears Craftsman LiftMaster Chamberlain...

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