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

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Garage door opener will run a second forward then a second in reserve. what do I do to fix it?

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Check the door sensors. Make sure they are pointed at one another and the small light on each one is lit and not flickering. Tweak them a little.

Posted on Mar 14, 2011

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Posted on Jan 02, 2017

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Starts with the remote but shuts off when a door is opened


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Does the travel direction make a difference? There is typically upward / downward force adjustments. Also when it stops will it start again immediately if you activate it.

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If motor continues to run but no chain action check for missing chain tooth or cam gear worn.

Sep 22, 2017 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I have a craftsman garage door opener that wont work and the main opener in the garage keeps blinking how can i fix this?


If by "main opener" you mean the wall control is blinking, press and hold the lock button for 3 seconds.

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

1 Answer

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It sounds like your chain is out of sync with the limit switches. Loosen the chain enough so that you can remove it from the sprocket on top of the motor unit. Now run the opener until the sprocket runs counterclockwise and stops. Now with everything attached and the door in the open position replace and tighten the chain. You are now in sync. You may need to tweak the up and down limit controls which are on the side of the motor unit.

Aug 16, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

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Double check to make sure the sensors are wired correctly. The 2 solid white wires go to terminal 2 and the wires with black stripes go to terminal 3. If the wiring is correct then you possibly have a bad RPM sensor. The RPM sensor is a small circuit board just in front of the motor.

Jul 13, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

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Loosen the chain enough that you can remove it from the sprocket. Run the opener until the sprocket turns counterclockwise and stops. With the door in the open position replace the chain. You will probably need to adjust your open and close limits per your owners manual.

May 23, 2009 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

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Will the remotes work in the garage? If yes but not outside with the door closed you might have radio interferace with your remotes. You might have to chage to a your reciever and remotes to a different brand (frequency). Sometimes it is less trouble to change out the operator. Chamerlain changed frequency from 390 (old) to 315 (new). 

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

1 Answer

Remotes quit working for garage door


I had the same problem with my Craftsman opener but different model. However to fix this I simply followed the instructions that came with the opener and reprogramed the remote to the opener. The instructions are in your owners manual and are pretty straight forward.. John

Dec 11, 2008 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

My garage door opener doesnt close all the way.


The motor is probably either stalling because the door is too stiff, or you have a beam break detector that is being triggered when the door is halfway down.

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