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

2 Answers

After power failure makes noise but will not open or close

We operated it manually during power failure but now that we have power it makes a noise but doesn't move. Lights are on but no movement.
Any help would be appreciated!

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  • drsmcbride Jan 02, 2009

    chamberlain liftmaster. We have 2 of them and one of them worked well after the power was restored but the other won't do anything but make a motor noise.

  • Anonymous May 16, 2009

    I HAVE A GARAGE OPENER WHICH THE MOTOR MAKES NOISES, BUT NOT THING WORKS. WHAT MAY BE WRONG WITH THIS? PLEASE HELP ME. :)

  • Joseph Chapman
    Joseph Chapman May 11, 2010

    On the one that is not working does thhe traveler move? If it does not where on the rail is it stopped?


  • Joseph Chapman
    Joseph Chapman May 11, 2010

    It sounds like the manual release is not reengaged. What kind of operator do you have? 


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Remove the cover and look at the drive gear which is just in front of the motor. Chances are it is stripped. It is available at any door opener service company and comes with instructions.

Posted on May 16, 2009

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Make sure that the troley is engaged with the garage door first

Posted on Mar 10, 2009

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How to open the door if no electricity


Almost all garage door openers have a switch mechanism that will allow you to open the door manually. It is usually a pull cord on the motor or track. Pulling it down usually deactivates automatic mode. Just pull it up into position when the electricity comes back on.


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1 Answer

What could be the problem with garage door opener?


Many openers have a short length of wire that serves as a primitive antenna; ensure the wire is hanging free.

The remote is a radio frequency transmitter, the other end in the garage has a tuned receiver.
Either one of these can drift from their original operating frequency which then can cause the system to fail.

Most modern openers are encoded so that they can resist operating with CBs and amateur radio signals and most require a one-time operation that allows the inside receiver to recognize (and remember) its dedicated remote by its frequency and the unique code the remote produces.

While this principle makes openers more secure, it also allows for more failures of the type you are having.

Take a look at the manuals available at the following site to see is there is one close enough to your model number to let you restore the programming between remote and receiver:

Free Craftsman Garage Door Opener User Manuals ManualsOnline com

Jul 21, 2014 | Sears Craftsman LiftMaster Chamberlain...

3 Answers

Garage door light blinks but doesn't stay on


Three blinking lights & door won't close by Candi
(Winston-Salem, NC)
Garage door will not open and close with remotes. Three blinking lights occur when we try to close door. What does this mean? It is a Linear unit.

I will assume you mean that your garage door will open with your remote but will not close. It should close if you press and hold the wall control button until the door is fully closed.

If that is the case, the 3 blinking lights indicate that your garage door's infrared safety beams are not properly aligned.

1) Check that the operator has power. The green lights on the sender and receiver should be lit.

2) If the receiver's green light is on, but the red light is off, the receiver has power but is not detecting the infrared beam from the sender. The red light might flash when the beam is partially detected. This can be caused by
mis-alignment or something blocking the beam.

Adjust the safety beam sender and receiver while watching the receiver's red light (stay out of the beam while aligning it). When the red light stays on, the beam is aligned and your garage door should operate normally.

http://www.linearcorp.com/pdf/manuals/LCO75.pdf

NOTE: If the receiver's red light remains off, check for:

1) Dirt on the receiver's lens,

2) Sunlight shining into the receiver's lens,

3) A short in the safety beam wiring (from staples or at the operator terminals).
http://www.linearcorp.com/pdf/manuals/LCO75.pdf

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Door suddenly will not close without holding the button down continuously that is inside the garage. The remote button will open the door but not close it. The door starts to close and stops right away.


It definitely sounds like a sensor problem. In normal operation, one sensor will have an amber or yellow light on, indicating power to the sensing circuit. The opposite sensor should have a green light on. If the yellow light is not on there is no power to the circuit due to a broken wire or circuit board failure. If the green light is not on or is flickering, the sensors are not aimed at each other or the light path is blocked.

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1 Answer

I have a Chamberlain LiftMaster Residential Garage Door Opener Chain Drive 2255. It no longer opens or closes. When you hit the button it makes a churning noise then stops. There is a code flashing on...


Remove the cover from the motor unit and check the drive gear. It is a white nylon gear just in front of the motor and is probably stripped. The part number is 41A2817.

Sep 07, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I just had a power outage. My garage door was open during the whole afternoon. I pulled the red trolley emergency cord and pushed the door down but I couldn't get it closed (locked). Why not?


IF THE OPENER IS IN THE OPEN POSITION THERE IS NOTHING TO LOCK IT IN THE CLOSED POSITION.
YOU CAN UNPLUG THE UNIT AND PLACE A VICE GRIP ABOVE A ROLLER ON THE TRACK. THIS WILL SECURE THE DOOR UNTIL POWER COMES BACK ON - DO NOT LEAVE THE UNIT PLUGGED IN - IT COULD BE DAMAGED BY A POWER SURGE WHEN THE POWER COMES BACK ON (ALL ELECTRONICS IN THE HOUSE SHOULD BE UNPLUGGED) ALSO IF YOU FORGET AND PUSH THE BUTTON THE VICE GRIP WOULD CAUSE THE DOOR TO COME OUT OF THE TRACK, MAKING YOUR CURRENT ISSUE SEEM SMALL.

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1 Answer

Craftsman Garage Door Opener - Gears need to be fixed


Unplug the unit and remove the cover, usually eight screws, if you see a lot of white dust in the cover check the nylon drive/worm gear, they will need to be replaced.

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1 Answer

Light flashing for 2 minutes after operation


I WOULD GO TO CHAMBERLAIN.COM THEY HAVE ALL THE MANUALS FOR THESE OPENERS AVAIABLE FOR FREE DOWNLOAD IN PDF FORMAT.

THE MANUAL WILL HAVE A GREAT TROUBLESHOOTING SECTION.

HOPE THIS HELPS

Jan 20, 2009 | Sears Craftsman LiftMaster Chamberlain...

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