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

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Hod do I align the sensor lights?

Both my sensor lights are steady green. Door will not open or close with either the wall opener or the remote. The motor runs, but nothing happens. I can manually open and close the door. How do I align the lights so it will work?

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  • 112 Answers

Your problem is not with the safety eyes. You have a stripped gear inside the opener. Take off the cover and you will have white shavings in the bottom of the cover. You can repair this with a liftmaster gear and sprocket kit.

Posted on Mar 05, 2009

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How do I fix my garage door opener? May have moved sensors. Door will not open or close. Tried to align the sensors but don't know if they are aligned or not. When I push the wall button I hear 2 clic


on mine i have one red one green just the same keep trying to adjust the blinker or both till it is solid color check wires on back of it also.

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It sounds like there might be a loose wire connection on the inside of the sensor. You could also be moving the position of the sensor slightly into alignment when you squeeze the sensor. You will need to disconnect the wires for the sensor on the garage door opener or disconnect the power. Then use a flatblade screw driver and carefully seperate the sensor case. Check for any loose connections on the wiring(you might need to re-solder the wire to the sensor eye). It sounds like a loose wire connection to me.

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Sears Craftsman will open and close with wall mount switch but will not work with the remote door opener


Clear any obstruction from between the safety sensors. Loose leaves, trash, and dirt on the lens of the sensor itself are all examples of things that can obstruct the sensor's signal.
  1. Check each sensor for a steady glowing indicator light. If both indicator lights are on, or if one indicator light is flickering, the sensors may be slightly misaligned. To check for misalignment; obstruct the beam of the sensors so that they cannot see each other. When the beam is blocked, the indicator light on one of the two sensors will temporarily go out. This is the receiving sensor. Remove the obstruction and loosen the wing nut on the back of the receiving sensor. Adjust the receiving sensor until the green indicator light goes out, if not already out, then realign until the green light is bright and steady, then retighten the wing nut. This usually takes a couple of attempts before it is back in alignment.
  2. If an indicator light is out on one or both sensors, check for a possible loose or shorted wire. Sensor wires are attached to the white and black terminals on the back or side panel of the overhead motor unit. Check that they are securely connected to each terminal. Also check the wires for any breaks, especially anywhere they are spliced together.


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Sometimes the sensors will be aligned closely enough that the logic board will turn on the receiving units light but it will act like yours. If you look real close at the light you will see that it is flickering ever so lightly. Tweak the sensor so the light is on steady.

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Press and hold for 3 seconds the button on the wall control with the lock icon.

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My service shop says that the sensors can go bad and still have the lights on steady. Also sun lite on the receiver sensor (green led) can cause a problem or if they have gotten wet.

Play with the alignment and if still a problem new sensors are about $40 a pair. Or if you have another door that works OK, swap the sensors to see if that is the problem.

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What it is is the electric beams at the door are getting blinded buy the sun or out of line. They are the two black boxes on both sides of the door about a foot from the ground. Put a piece of card board in front of them not blocking the beam dut to block the sun. All that they are is safety beams for kids so they do not get hurt. If you have to move them to the top where the sun will not hit them. Sorry to say though you can not remove them all the way. Also make sure the lite on them is not blinking if so they are out of line.

Good Luck and Please Rate FixYa!

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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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The sensor eye - or more likely, the other end, the sensor light - probably got knocked out of alignment. The eye should have an LED on it - possibly one that glows green when it's ready to close or red when it's obstructed or out of alignment. Try adjusting the light until the LED on the receiver glows green.

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