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

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Craftsman 1/3 HP - Door would go all the way down, stop and then come back up..without hitting the button. Now it only goes down four or five feet and then stops and comes back up. The lights do not flash like something is blocking the door.

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You may have a bad IR sensor which is a small circuit board just in front of the motor. You might try increasing the down force which is on the rear of the motor unit near where all those white wires go.

Posted on May 04, 2010

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1 Answer

Circuit breaker tripped. Once reset, garages door opened all of the wa. The door only goes down two feet and stopped. When button is pushed again, comes back up hitting the stop quite hard?


Check the travel both up and down without the garage door connected. Check you owners/installation book that came with unit. When you assembled it did you have the trolley in proper place (up against a screw driver. If you don't set trolley and install chain you will have problems with the travel. Sit down and reread instructions and ensure that it assembled correctly.

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I have craftsman 1/2 hp door opener and when the door has been down for three to five hours it will just open up by it self


Disconnect the wire from terminal #1 on the rear of the motor unit. This will disable both the wall control and the wiring to it. If this stops this problem then you can by a process of elimination determine if it is the wall control or the wiring. Replace the wire at terminal #1 and remove the wires from the back of the wall control. Remember which wire goes where. If your problem still doesn't happen then the wall control is bad.

Feb 22, 2011 | Sears Craftsman LiftMaster Chamberlain...

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I have an access master door opener..it goes up about 6 inches and stops, hit switch again, goes down, hit switch again goes up about two feet, hit switch again goes down, third time switch nothing until...


Door sensors have nothing to do with door opening. Only closing. It sounds like you have a bad gear in the motor unit. Remove the cover and it will be obvious if the gear is bad.

Feb 15, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Door stopped opening!?!?!?!


Remove the cover of the motor unit 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.

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

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My garage door opener only opens the door 1-2 feet high and then stops. What could be the problem?


My guess is that you have a broken spring. Look at the springs and see if you can see a gap in one of them. If you pull the release and you can't open the door without struggling then you definately have something wrong. The opener is trying to heft weight that it is not designed for and is stopping itself to prevent damage.

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

1 Answer

My craftsman 1/2 hp garage door starts to close and then opens up


I had a simular issue, except mine was that the previous owner decided to mess with all the settings and mounts and screwed everything up.

The problem isn't your force sensors its your downwards stopping sensor on the opposite side of the opener. For me I had to take the entire panel off and replace the sensor back in its holder, but try adjusting that sensor setting (clockwise goes down, counterclockwise goes up).

If that doesn't work then i dunno:)

Also set both force settings in between 0-1, for some reason with mine if i set it higher it would set them off....

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

1 Answer

Programming kepad for Sears Craftsman Garagedoor opener 1/2 hp


The only procedure I have ever followed is to press the learn button and then enter the code, and not do anything else. I think your last step of holding the button until the light goes out is clearing codes as fast as you enter them. Just stop after you enter your code and let the learn mode time out on its own. That should do it.

And don't put your head through the wall. It just causes more headaches.

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

2 Answers

Chamberlain Liftmaster Professional 1/2 HP


Okay...upon further inspection, my left spring has broken in two. Going to call around for some quotes to replace the spring. Thanks for the suggestions.

Jul 21, 2008 | Sears Craftsman LiftMaster Chamberlain...

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