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

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Problem with Garage Door - Stopping and Starting

I am having a problem with my garage door starting and stopping when I press the garage door button. If I keep it pressed all the way down then the garage will shut. The second I let go of the button the garage door stops and goes in the opposite direction. How do I fix this issue ? The sensors are lined up. I wonder if I have a short or something.

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If the main light is flashing 10 times when the door reverses it is a sensor problem. Make sure the small light on each sensor is lit and not flashing ever so slightly. The sensors must be pointed at one another for both lights to be on.

Posted on Jul 12, 2009

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Posted on Jan 02, 2017

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I have a problem with a guardian 21230L garage door opener when you push the button the light flashes but no door movement happens can you help cheers


if your saying that the light on door opener housing is flashing then stopping after a few moments , this is a sign of a fault in door safety's , either the door has to much friction now to move or beam detectors have sensed a problem

Nov 13, 2015 | Building Materials

1 Answer

My liftmaster will open with the remote but to close the door, we have to hold down the wall unit. It starts to close, jerks to a stop, then we have to press and hole the button and it closes.


Hi, it is probably the safety photo beams out of alignment or not working, when this happens the garage opener goes into 'dead man' operating mode, ie you need to keep the button pressed for the door to operate. You can find user and installation manuals here - Liftmaster Garage Door Opener Installation Manuals

Sep 07, 2011 | Sears Craftsman LiftMaster Chamberlain...

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

Nov 21, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door not closing completely


lubricate track and drive chain or screw if it resists moving too hard it thinks it hit something and will back up

Jul 09, 2009 | liftmaster Chamberlain Garage Door Opener...

1 Answer

Keypad for chamberlin garage door opener stopped working


You need to reprogram the keypad. Press and release the learn button on the back of the motor. Within 20 seconds, press your four digit code into the keypad and press and hold the enter button until the lightbulb on the motor blinks once. You are finished.

Feb 24, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

My craftsman garage door is about 8 years old. It


Make a slight adjustment to the Upward force on the side of the machine. Turn the screw a 1/4 turn each time and test, see if that helps. Also, make sure there are no obstructions or friction when the door opens and closes. Try it manually first.

Feb 18, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Need to change the freqency on a lift master garage door


Chance are they set there remote when you were using yours. To reset your opener you need to clear all the codes on the back of your opener itself there is a square button purple or red depends on how old it is. Press and hold that button until the LCD light turns off. Press your remote to make sure it has stopped working. Then press the button again only for a sec until the light comes on and starts to flash then press your remote button. Repeat for each remote.

Feb 10, 2009 | Sears Craftsman LiftMaster Chamberlain...

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