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

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Door travels all the way to the floor but comes back up

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If when the door reverses the main lights flash 10 times you have a bad or misaligned door sensor. If the door hits the floor and reverses but the main lights do not flash then the door is traveling too far. On the side of the motor unit you will find the 'down limit' control. Turn this in the opposite direction of the arrow printed on the cover. Some tweaking may be necessary.

Posted on Nov 13, 2009

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Garage door gos down and hits the floor and reverses back up. There is also a green light on one sensor and a yellow light on the other sensor. What would be the problem.

I know sometimes if the sun is shining towardso the sensor it will start to go up before hitting the floor but this soundshould like you may have a misaligned sensor or one of them going out but this doesn't explain why it hits the floor first so my answer to you is that the travel distance setting on the motor is not set right it thinks it's hitting something besides the floor the settings for the door travel distance should be on the back of the box that contains the motor I'm sure this is what is causing your problems

Sep 28, 2016 | Chamberlain Powerdrive PD422D 1/2 HP...

1 Answer

How do i set the travel limits on my craftsman garage door opener 139.53919

  • Open the garage dooricon1.png fully by pressing the wall control button. The bottom section of the door should be right at the header in the "full open" position. If it is too far back, the door cable can become misaligned. If it is not back far enough, you may not be able to get your vehicle in and out of the garage.

  • 2

    Position a stepladder behind the garage door openericon1.png motor. Locate the limit adjusting screws on the left side of the motor housing. Have a friend stand by the wall control button.

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  • 3

    Insert a screwdriver into the slot for the "up limit" adjustment screw. Turn it to the right to decrease the door travelicon1.png and turn it to the left to increase it. Turn the screw in small increments.

  • 4

    Close the garage door by having your helper push the wall control button. Notice the seal between the door and the floor--there should not be any light coming through. Adjust the "down limit" screw in the same way if necessary.

  • 5

    Operate the door by the pressing the wall button and check your adjustments.

  • Read more: How to Adjust a Craftsman Garage Door Opener '

    Jan 12, 2013 | Sears Craftsman LiftMaster Chamberlain...

    1 Answer

    Rain water filling up floor board on driver's side of 05 Chrysler 300 while sitting in driveway; appears to be coming through door. Could it be a floor plug missing and how would the would water...

    Most newer cars don't have drain plugs in the floor. So it must either be your window does not close tightly or the rubber seal is completely gone around the lower door.

    Are you getting enough rain that it reaches the floor board of your car?

    Jun 28, 2011 | 2005 Chrysler 300

    1 Answer

    Garage door loses travel settings after a day or two.Door closes then reopens after hitting the floor.I made the proper travel adjustments on the side of the unit then after 1 or 2 days the door hits the...

    I have been having almost the same problem. My up limit setting is changing. I intend to replace the limit switch assembly. I know of nothing else that can cause this problem.

    Dec 31, 2010 | Sears Craftsman LiftMaster Chamberlain...

    1 Answer

    I have Sears Craftman 1/2 HP garage door open that want stay shut when you push the remote the sensor wire broke fix that. Now the door goes down and come back up. All sensor are led light are green...

    Check the sensors again. Our unit has one amber and one green when working and if something (even a weed) breaks the optical beam it reverses and the lights blink. We've also had bright sunlight interrupt the beam. (The test for this issue is to stand such that you cast a shadow onto the sensor without being in the beam and then attempt to close the door with the remote). Next check if the door is binding during travel. If it is, check the tracks for plumb with a level and make sure the door rollers and tracks are undamaged. If a rail is crimped anywhere, it could be cause the problem. You can find some garage door sales places that sell the track sections and rollers to replace damaged parts. Check your local phone book and call around. In some cases, the door jamb may be damaged (lowering the header and shrinking the entire door area). This may require calling a professional to fix.

    If the door itself is moving easily, then it sounds like the door might be hitting the floor too lightly or trying to go past the floor and triggering a safety reverse. On most of the openers, there are several adjustments you can work on to reset this. First try adjusting the down limit to above the floor and then bring it back to the floor. (However, usually these do not make the opener light blink.)

    Alternatively, adjust the downward force to a higher value.

    Without knowing the model of your Craftsman opener, I'll just use the directions for mine. All of these are adjusted with a flat blade screwdriver. Always test each adjustment with a complete up and down cycle.

    The height limit control is on the side. (It's the forward one of two screws inside the cover - you should be able to reach them thtrough holes in the cover. Unfortunately, sometimes it's easier to get to them after removing the cover. The cover is held by 4 screws - 2 on each side.) To decrease the travel, turn the Down screw clockwise. One full turn of the screw is 2" of door travel.

    The force controls are on the back with the down adjustment on the right. Turn this clockwise in 10 degree increments and test each time.

    It is possible to overheat the opener with too many open and close cycles. In that case stop adjusting the unit and wait 15 minutes for it to cool.

    I hope this helps.

    Cindy Wells

    Nov 27, 2010 | Sears Craftsman LiftMaster Chamberlain...

    1 Answer

    Sears technical support for craftsman products- Will not work with car and remote. Goes down with internal contol, but goes right back up. Tried resetting it fro car and remote, with no results

    Sounds like you have a couple problems. The remotes not working is probably the logic board. The door coming right back up is either the door sensors misaligned or the door is traveling too far and hitting the floor.

    Jan 20, 2010 | Sears Craftsman LiftMaster Chamberlain...

    1 Answer

    Door closes hits the floor and reverses. It appears that the door has a sensor or something that causes the door to reverse once it hits the garage floor. What would cause this problem? The eyes are lined...

    Garage doors have a setting that will do this. The door is traveling too far down and when it hits the floor, it thinks it is hitting something. There should be adustment knobs on the back of the unit to solve this. Good luck!

    Nov 22, 2009 | Sears Craftsman LiftMaster Chamberlain...

    1 Answer

    Sears Craftsman 3/4

    Open up the caseand look at the travel assy. Sometimes the limit (up or down) do fall off the assy. Just snap it back on.

    Jan 06, 2009 | Sears Craftsman LiftMaster Chamberlain...

    3 Answers

    Garage door won't close

    your door travel screw is set to go too far on the downward travel. you need to set the down travel. It is set to go too far down. find the screw adjustment on the unit that says close and back off the screw a full turn until door stops short of floor. then start turning screw other way until door just touvhes floor.

    Feb 24, 2008 | Sears Craftsman LiftMaster Chamberlain...

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