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

1 Answer

Craftsman 1/2 hp opener

My 1/2hp opener after reaching full open status will slip back down 12 to 16 inches and then re-activate the motor and go back up. This will repeat 3 or 4 times before finally stopping at one or the other position.

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  • kenreneer Sep 10, 2008

    Thank you for your interest and help. I believe and hope that stripped gears are not the problem as the unit is less than a year old and has been doing this from the start.

    Could it be a spring problem?

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1 Answer

I am sure that your lift gears have stripped and need to be replaced.

Posted on Sep 10, 2008

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Craftsman 1/2hp garage door opener works fine to open door but to close I have to hold button down. If not, door won't move and lights flash 10 times.


10 flashes mean sensors are obstructed... something is in the way of the door or they are not facing each other. Clear the obstruction or realign the door and it will work.

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The down adjustment broke off


Check the micro switch that will be activated when the door reaches the closed position. It might need to be readjusted as it is supposed to be activated just as the door reaches the fully closed position to stop the further movement of the door. If it does not get activated at that point the door will try to open further but sence an "obstruction" and start opening again as a buildt in safety measure for protection against possible injury or damage to property.

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I have a 1/2hp master mechanic door opener. when I close the door it goes the full travel down and then opens back up. i checked the eyes and everything was lined up. do you have any suggestions?


Look at the setting for "fully closed". it sounds like yours is set for slightly than the actual opening....So, the door reaches that location, and it thinks it hit an obstruction, which causes the door to open....While you are there, reset the sensitivity settings.

What I would do is back off the closed position setting so that the door stops an inch or two off of the ground, then adjust until the door is in the correct closed position...

You are correct on the "eyes" (infrared sensors) being lined up, if they were not, the door would not close at all.

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1 Answer

Garage door repeatedly drops after opening.


Remove the cover from the motor unit and check the drive gear.

Jan 16, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Craftsman 1/2hp garage door opener does not go down to floor


I'm no expert, but on a previous door opener I had (don't know the brand), the side adjusting screw basically adjusted a limit switch, which was located inside the plastic housing (where the motor is). I was able to remove the housing, figure out which limit switch was actually being contacted "too soon" on the way down and adjusted it while watching it.

Just a suggestion, you might take a look.

just keep your hands out of the way of the chain and sprocket if you do take the housing off. .

Mar 03, 2009 | Sears Craftsman LiftMaster Chamberlain...

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Motor runs but door does not open


you have a stripped gear on your opener. Replace gear and sprocket kit

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

1 Answer

Chamberlain 1/2hp won't open/close and learn LED flashes 5 times


The gear needs to be changed kit #41c4220a. Be sure to change the bottom bushing on the motor mount.

Jan 02, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

When cold outside, door only opens a few inches


1.Check to see if the door is running correctly. 
  A. Run the door down and pull the emergency release. See if the door will run easily by itself. 

  1. If it runs hard by hand try lubricating the rollers and hinges with silicone spray or some form of lubricant (not WD 40) 

  2. If the door is heavy and falls back to the ground, you probably have a spring issue (either broken or needs more tension) in this case call a professional door repair company in your area.

  B. If the door runs fine then check the up force on your operator (the box that hangs from the ceiling and reads Craftsman). If the light(s) on your operator go from front and/or back, the force adjustment screw is on the back of the operator. If the lights are on the sides of the operator then the force adjustment screw is on the right side (looking from the back of the operator and facing the garage door). Turn the light blue adjustment screw with the up arrow to a higher number.

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1 Answer

Sears Craftsman 1/2hp Garage Door Opener


Thats one of the symptoms of a lightning strike or a power surge. Without actually being there I would suggest replacing the back-board. But as with lightning strikes and power surges sometimes other electronic components could have been damaged as well.

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

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