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

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When I try to close my garage door --4100 model-- the door travels part way down, then reverses and goes to the up position. I can force it closed by keeping the garage door wall switch continually pressed, but even that will reverse when I release the switch near the end of the "down" travel. Then I have to press the wall switch alternately as the door goes back and forth to the closed position. I reprogrammed the two manual door openers and the automatic (universal??) door opener that comes with a Toyota Camry. When the travel stops, the light on the Chamberlain unit flashes on and off, and the green light next to transmitter button also lights up.

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The sensors sound like the first choice,also check the receiving wire hanging down ,it picks up the signal,I ve had a new battery do the trick,check the remote and the door pad ;inside and out ,if you have one,,,mike

Posted on Jul 05, 2012

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Check your door sensors. Make sure they are pointed at one another and the small light on each one is lit and not flickering. Tweak them a little. If you cannot get both lights to come on you have a bad sensor.

Posted on Dec 30, 2010

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4 Answers

Door opens itselv after closing


most likely the down stop is set to low, the door hits ground and reverses. so either change the down stop position or increase the down force so it will not reverse upon contact.

Dec 06, 2015 | Building Materials

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I have a craftsman garage door opener. Model number 4184315 7D When I close the garage door it will automaticly open by it's self. There is nothing obstructing the sensor that prevents the door from...


There are two sets of adjustments. Down position and down force, If the travel is set to far in the down position the max down force setting will trip and the door goes back up.

sears-craftsman-41a5021-2-tp_3035774187492923427f-dmbde0w01a5yu2mfdv43xlfn-4-0.jpg
Adjust he down position until a slight gap is visible in the down position. Adjust slight steps until no gap is visible.

If return trips increase the down force slightly . Position adjustments are on the side, down force blue knobs on back. Note adjustment positions before beginning so if you get confused you can start over.

Hope this helps?
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Jun 23, 2017 | Kitchen Ranges

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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

The garage door goes all the way down but then goes right back up - it does not close


Had similar problem. Re-program travel and force limits. Make sure that travel limit (down) does not go too far (thus excessive force). Apparently this system has a force sensor that senses if there is something in the way of the door. This is different from the safety sensor "eyes". The problem in your setup is that you have programmed the door to travel down too much and he system looses its ability to use force sensor. Adjust travel limit (down) to a little less travel and you will be fine.

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No matter when i adjust the force the door goes down, stops briefely, them returns to open position. can't get force adjust to let it stay down.


If the door is hitting the floor and then reversing it is traveling too far in the down direction. Locate the 'down limit' on the side of the motor unit and turn it in the opposite direction of the arrow printed on the cover. Some tweaking of this control will be necessary to get the travel just right. The force adjustment affects the safety of your opener. Try to put it back where it was.

Sep 30, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I have Craftsman ½ HP Garage Door Opener Model 139.18458D. It reopens immediately after closing. Sometimes it works normally, and sometimes gives this problem. I have tried adjusting the close force,...


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.

Sep 06, 2010 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

My Craftsman garage door opener opens fine. It


It could be closing too far or the sensitivity could be set too sensitive.

Lube the springs, wd-40 rust may be the whole problem.

If the door hits and the opener continues to move until the rail flexes upward and then reverses - probably the travel adjustment.

Does the door close and stay closed if you hold the wall button down constant until it closes? - this would indicate a safety eye problem.

If the door reverses before it hits the floor or just as it hits the floor it could be the sensitivity or if the safety eyes are mounted to the track they could be flexing enough to move the eyes out of alignment.

Hope this helps.


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

2 Answers

The garage door closes and then opens up again, I have to close it several times before it secures. There are no obstructions. Is this a sensitivity problem?


More than one thing can cause this type problem.

If the main light flashes 10 times when the door reverses it is a door sensor problem. Make sure they are pointed at one another and the small light on each one is not flickering ever so slightly.

If the door reverses when it hits the floor it is a sign that the door is traveling a bit to far. The adjustment for this is on the side of the motor unit. Turn the 'down limit' in the opposite direction of the arrow printed on the cover. Some tweaking will probably be necessary.

Jul 06, 2010 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

Sears craftsmen belt drive opens but doesn't close properly. It will travel a foot to three feet and then reverse. If the door is disengaged, and in the up position, the belt will do the same thing. If the...


Is the belt or part of the opener hitting on the door as it trys to go down? Since if the door is down the opener goes all the way down, it seems that it might be hitting / binding on the door somewhere and then reverses.

Dec 28, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door opener will not continue to open garage door.


You say your door won't open and then you say your door won't close. Anyway you have a door sensor problem. Make sure they are pointed at one another and the small light on each one is lit and not flickering. If you tweak them and the lights don't come on then you have either a wiring problem or a bad logic board.

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