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

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LiftMaster garage door opener won't open. When push button (from either remote or "door-bell" style button on wall), unit makes a slight humming sound for a couple of seconds, then nothing...?

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Check the door springs and also the drive gear. The gear is a white nylon gear just in front of the motor unit. It will be pretty obvious if it is going bad. The door spring may be broken.

Posted on Oct 25, 2010

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Posted on Jan 02, 2017

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1 Answer

I have the door bell style wall button-how do I unlock the unit so the remotes can be synched? I have pressed green button on back of unit with remotes but they won't operate the door.


You don't unlock anything to program the opener for the remotes. If everything is working you do this:

Press and hold the button down on the remote while you press and immediately release the smart/learn button. Do this for each remote.

Jul 11, 2012 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I have a 3/4 horsepower liftmaster garage door opener, both the remote and the wall button won't close the garage door but both will open the garage door. however, the garage door will close if I hold...


If when closing the door it reverses to the open position and the main light flashes 10 times it is a door sensor problem. Make sure the small light on each sensor is on and not flickering ever so slightly. (check closely) Tweak them a little even though they may seem to be okay. Check for 5vdc between terminals 2 and 3 on the rear of the motor unit. If there is no voltage or if it is greater than 6vdc the logic board is bad.

Sep 26, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+: My craftsman 1/2 hp garage dood does not close whe...


If the main light flashes 10 times when you try to close the door it is a sensor problem. Make sure they are not flickering ever so slightly and that they are not loose on their brackets. Tweak them a little bit.

May 18, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage Door opened but will not close. I opened


I think the trolley has jammed against the bolt just in front of the motor unit. Remove the bolt and then run the door until it is closed. With the door closed locate the 'up limit' control on the side of the motor unit. Turn this 2 turns in the opposite direction of the arrow printed on the cover. Replace the bolt.

Sep 01, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage Door only opens with wall unitq


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.

Dec 29, 2008 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

REMOTE CONTROLS WILL NOT WORK-WALL BUTTON FLASHING RAPIDLY


Does your wall switch have a lock feature? By pressing the lock button, the remote control is disabled. A flashing light indicates this feature has been activated.

To deactivate, press and hold the lock button for 2 seconds. The flashing should stop and your remote should work again.

Dec 03, 2008 | Sears Craftsman LiftMaster Chamberlain...

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