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

2 Answers

Craftsman 1/2 hp door opener

My garage door opener is now having problems with going either up or down. I've tried adjusting the up and down limits and/or the force. The door will either go up fine and not go down or will go down fine but not up. I imagine that I have to keep adjusting until I find the right mix. But if I could possibly get some better direction I'd appreciate it.

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  • 1231 Jul 21, 2008

    craftsman 1/2 hp garage door opener just started this.  not wanting to go down by itself unless i hold he button down.  nothing to do with door, does same thing when disengaged from door.  blinks about 15 times after i push the button and it lurches to a stop.  what do the 15 blinks mean??


    ches in colorado

  • mb041858 Nov 01, 2008

    My door does not want to go down when it getscolder. I have tried adjustung the settings but no help.

  • Anonymous Nov 01, 2008

    My garage model is 139.53973SRT Serial # 02502C00460. Whenever i try to close my garage door goes down and then it slides back up again. what should i do.

  • Vovie Nov 04, 2008

    My garage door won't go up or down. I have to unplug the opener and allow the system to reset itself. Then it works a few times and I need to start the process over again. What to do next?

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Replace the logic board
http://www.chamberlain-garage-door-openers.com/circuitboardcompatibilitychart.htm

Posted on Jan 10, 2008

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My problem is similar, but it seems to occur only at temps near or below 40 degrees. I have to hold the wall mounted control to force it to close as the remotes do not work on closing but only opening.

Posted on Oct 30, 2008

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1 Answer

We have installed the craftsman garage door opener and have continually adjusted the up and down travel limits and the door will not stay down


try adjusting the down force. the force necessary to may it reverse. it may be set too light. increase the down force and see if that helps. usually screw in back of unit. and usually labeled.

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It sounds like the door is traveling too far in the down direction. When it hits the floor the safety causes it to reverse to the open position. You need to adjust the 'down limit' not the force.

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Loosen the chain enough so that you can remove it from the sprocket above the motor unit. With the door closed run the motor until the sprocket turns clockwise and stops. With everything attached replace and tighten the chain. Some adjusting of the up and down limits will probably be required.


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When I try to open the door is go up a little be an go down I need to try five o six time and the door going to open What I need to do, or what is the problem? My garage door opener is Craftsman Mod....


Make sure one of your door springs isn't broken. If they are okay you can adjust the up force which is on the back of the motor unit. Increase it about 1/4 turn and try.

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1 Answer

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Use a flat blade screw driver to adjust these limits by inserting it in the holes as labeled . Start gradually adjusting and stopping the travel if needed by pushing the open/close control as per usual.

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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.

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I have a Craftsman 1/2 HP chain drive garage door opener.


You need to take the cover off the motor unit and watch how the limit switch assembly works. If the door is not stopping when the contacts make then you have a bad logic board.

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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. .

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