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

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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 floor hard again then reopens.

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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.

Posted on Dec 31, 2010

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2 Answers

When the door closes, it automatically reopens. There are no obstructions so that isn't the issue. If I disconnect the door and cycle the automatic is closes and then immediately reopens.


make sure that the auto matic reverse circuit light is being read correctly. they is a light extending a beam of infared light, you can't see it, to a reflector across the garage at the floor level at the garage opening. There should be an indicator light, usually green and red. Line up the light and reflector until the green light comes on.

Mar 08, 2011 | liftmaster Chamberlain Garage Door Opener...

1 Answer

How to program my garage door opener #53985 have to remotes and a wall button. Door keeps wanting to reopen after closing. Fred Haul.


Your problem has nothing to do with programming. It is one of two problems. Either the door sensors are misaligned or the door is traveling too far in the down direction and when it hits the floor the safety reverses it to the open position.

Make sure the door sensors are pointed at one another and the small light on each one is lit and not flickering. Tweak them a bit.

The down limit adjustment is on the side of the motor unit. Turn it a bit in the opposite direction of the arrow printed on the cover.

Feb 21, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

The garage door closes and then the door reopens.


If the door is hitting the floor and then opening it is traveling to far. Locate the 'down limit' on the side of the motor unit and turn this control a bit in the opposite direction of the arrow printed on the cover. Some tweaking will probably be necessary.

If the main light is flashing 10 times and the door is reversing it is a door sensor problem. Make sure they are pointed at one another and the small light on each one is lit and not flickering. Tweak them a bit. If you cannot get both lights to come on you have a bad sensor.

Jan 06, 2011 | 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

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...

1 Answer

Door closes to fast and sometimes re-opens by itself


A couple possibilities here. Make sure the door spring isn't broken. Your door is traveling too far in the down direction and when it hits the floor the safety sensor reverses it to the open position. The down limit adjustment is on the side of the motor unit.

Jul 06, 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...

2 Answers

Garage Door will not stay closed.


You need to check the adjustment for the travel of the door ... All automatic closers have a built in safety mechanism that prevents children, pets and even yourself from being crushed by the door ... so if the travel is set to low the door will hit the ground too hard and safety mechanism will activate opening the door again! Look at you documentation for how to adjust this for your particular model :)

Sep 29, 2009 | Sears Craftsman LiftMaster Chamberlain...

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