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

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Garage Door The garage door sensors green lights have gone out and the remotes only will not let up or down the garage door. It's acting as if it has something in the way. Blinking lights on the garage door.

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  • pea50 Jul 21, 2008

    Both sensors are out

  • Anonymous Dec 09, 2013

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1994 1/2 h/p craftsman garage door opener sensors are both green but door opens as soon as it is shut

Posted on Oct 30, 2009

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Are the sensor lights located on each side of the garage door opening? Have you checked to see if they are in alignment with each other? Also check to see that any wire from the sensors are disconnected on the motor or at the sensor itself. Good Luck! Countrycurt0

Posted on Jul 21, 2008

  • Curt Downs Jul 21, 2008

    If there is no light on the sensors, there must be a bad connection between the sensors and the motor. Check all wires from sensors to motor to see if there are loose connections, cut wires, or wires that came off at connections.Countrycurt0

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1 Answer

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!


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You need to hook those wires back up and then check the door sensors very closely. If the light in one of the door sensors is dim or flashing it will cause your problem.

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It could be the garage door motor that is acting up. Try closing it with the button in the garage. If that's not the case, you may need a different garage door opener.

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Make sure the door sensors are pointed at one another and the small light on each one is lit and not blinking. Tweak them a bit. If you cannot get both lights to come on you have bad sensors.

Sep 12, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I am having the same problem. My door will close if I hold the garage door button down in the garage, but if I try to close it with the remote it goes down a quarter of the way, the light flickers then...


You have a door sensor problem. Make sure the small light on each sensor is not flickering ever so slightly. Sometimes very hard to see. Tweak them just a bit. The color of the sensors is normal.

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1 Answer

My Wayne Dalton garage door will open with remote but not close. The only way it will close is to hold down the wall mounted garage door button. Then the light goes on and off while clicking. I have...


your infrared sensor is either misaligned, faulty, or you have a broken wire from your sensor to your door opener. (Flashing light indicates infrared light path is broken). both sensors should indicate green led. door wil not come down is safty feature to prevent door from closing when light path is broken.

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1 Answer

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The unit is in the lock mode, push and hold the lock button in for about two seconds and the green LED should stop flashing. Your remotes should work.

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1 Answer

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do you have the sensors at the bottom of the door? if so they might be out of alignment. all you have to do line them up by getting the green light solid. let me know if this helps you.

Dec 18, 2008 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Sensor lights not working on door opener


If the sensor light or receiver gets kicked, it can be knocked out of alignment. If it's not aligned, it will act as though it is blocked -- in other words it will open, but not close.
I fixed my buddy's opener not long ago -- you should have two parts of the sensor, near the floor at the bottom of the door. One is an infrared light, the other is a receiver. The receiver should have a little LED on it. This glows green when it is receiving a clear signal from the other side. If your's is glowing red when you can see that the path is clear, try adjusting the aim of the infrared light. You should be able to gently move the light from side to side until you see the LED on the receiver glow green.

Dec 05, 2008 | Sears Craftsman LiftMaster Chamberlain...

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