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

1 Answer

Garage door won't shut after changing gears

Door closes and then goes back up. Made adjustments and still does not stay closed. Help please

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  • maryann cazin Jan 15, 2009

    Thanks seems to be working now. Had red and blue wires crossed. thanks again.

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  • 244 Answers

If you changed gears, you may have chain out of sync. read instructions with gear kit on how to sync chain.

Posted on Jan 15, 2009

  • marty metzger Jan 15, 2009

    what blue wire on a chamberlain

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1 Answer

Garage door will close, stays shut for a few seconds and then opens on its own.


The opener is closing too far. On the side of the opener, you should see 2 white knobs, recessed into the side. Using a flat blade screw driver, adjust the close knob (closest to the door side of the opener), anti-clockwise until the door will close gently on the floor.

Aug 24, 2013 | liftmaster Garage Door 1/2 Hp

1 Answer

My Liftmaster garage door won't open or close. I hit the button and it make a sound and clicks but won't close


Remove the cover and check the drive gear. It is a white nylon gear just in front of the motor. It will be obvious if it is bad. Tell me - if it won't open how do you know it won't close?

Feb 22, 2012 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I have a new garage door opener that has the black and purple buttons to adjust the force and travel of the door ...... eveything is working well except when the door closes it goes a little to far, the...


I have a feeling the down force adjustment is set much to high. If the door is hitting the floor hard enough to bend the rail the safety should be reversing the door to the open position. Maybe this will help.

The force adjustments control the pressure used to open and close the door. A new garage door opener from the factory is set to the lowest possible force adjustment. If you have a properly balanced door, the forces required to open and close the door should be minimal.



The force adjustments are usually located on the rear of the garage door opener and/or under one of the light lenses, If your opener has two lights. If you have lights on the side of your opener, the force adjustment will be located under the right light lens. The force adjustments are labeled with an arrow indicating open or close and numbered 1 to 9, with one being the lowest force and nine the highest. The force adjustments can only turn 260 degrees, or ¾ of a complete turn. Changes to the forces should be done in 10-degree increments. Please remember that too much force will interfere with the proper operation of the safety reversal system. Do not increase the force beyond the minimum required to close the door. Do not use the force adjustments to compensate for a sticking, binding, or unbalanced door.

Nov 11, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

We just replaced a broken spring (re[laced both sides) on craftsman garage door opener and now the door won't shut all the way. It goes down to about 12" from closing and then goes back up.


YOU COULD HAVE THE WRONG SPRING OR NOT ADJUSTED PROPERLY. YOU COULD HAVE AN OPERATOR ADJUSTMENT PROBLEM.

HOW DOES THE DOOR WORK MANUALLY??

IF IT IS HARD TO PUSH DOWN AT THE BOTTOM - SPRING PROBLEM - IF IT WORKS AND CLOSES VERY SMOOTHLU AND EASILY THEN YOU COULD ADJUST THE DOWN SENSITIVITY - JUST A LITTLE.

Jun 19, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Door won't stay closed, then opens only partially.


If the main light flashes 10 times when the door reverses it is a door sensor problem. Each sensor has a small light that must be on and not blinking for them to work properly. If one of them is not on tweak them a bit to make sure they are pointed at one another.

The stopping about 1/3 of the way up is either a broken door spring, a main drive gear that is going bad or an adjustment to the 'up force'. The 'up force' control is on the back of the motor unit near where all those white wires go. Increase it a bit. It will sometimes compensate for a gear that is going bad but if this is the case it will start doing the same thing soon.

Oct 19, 2009 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

Wanye dalton door opener modal 3018. goes up 1 foot and stops


Check your door springs. Usually just over the door and can be seen when the door is closed. A broken spring is the most common cause of this problem.

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

1 Answer

Garage door opens about 2 feet and then closes in same cycle


There is an issue with the limit settings. They are the three white screws you can see with the cover off. Put the door in the down position. take the small white piece off the bottom of the gear and sprocket assembly. Turn the center screw until the silver "wing" is at the bottom position. Put the white piece back on the bottom of the gear and sprocket. Adjust the up screw until the door opens fully. Check the force settings. They both should be set on 4-5.

Feb 26, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Changed gear box in craftsman garage door opener


you did not give enough info. If it closes completely and right away goes up, if bulb blinking. if it is, something on door is blocking safety beam. If light is not blinking, DECREASE down travel.

Jan 15, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door opener does not reverse after hitting obstruction


release the door from the opener and see if door moves freely the check proper torsion by moving door up to 3-4 ft if it stays in this area torsion is properly set if not call technician to adjust torsion
if door does not move freely all the way up and down check for binding track alighnment and roller condition. the adjust closing pressure.

Jan 07, 2009 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

Craftsman door opener will not stay down


the sensor should shut door off whrn it reaches the closed position (adjust the shut off arm!

Dec 10, 2008 | Sears Craftsman LiftMaster Chamberlain...

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