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

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3.75 craftman garage door goes down a foot then immediately reverses back up

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Garage door moves about 3" and comes back up. The bulb flashes 6 times. And the green light in the back flashes 4times

Posted on Dec 11, 2012

  • Philip Dec 11, 2012

    Garage door moves about 3" and comes back up. The bulb flashes 6 times. And the green light in the back flashes 4times

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If when it does this your main light flashes 10 times it is the door sensors. Make sure they are aligned properly. If the main light doesn't flash 10 times then you most likely have a bad RPM sensor board. It is a small printed circuit board just in front of the motor.

Posted on Jun 28, 2009

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1 Answer

My craftman garage opener will not close. The up arrow blinks 3 times and the down arrow blinks 2 times. the button on the unit will not open or close it. It will move about a foot then reverse back.


try holding in the wall button the whole time. if the door closes, then you have an issue with the sensor wiring. if the wall button closes the door while holding in, then post a comment below and we will tell you next steps.

Oct 02, 2015 | Building Materials

1 Answer

Installed craftman garage door opener,door touches the bottom goes back up and stays open,have adjusted upforce and downforce many times,very little downforce when it touches the cement. Brian


On the side of the motor unit you will find the up and down limit adjustments. You need to turn the down limit a little in the opposite direction of the arrow printed on the cover. Some tweaking and you should get it right.

Apr 04, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Craftman garage door opener closes via the key pad and immediately reverses and reopens. have adjusted travel limit as well as force. Any suggestions


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 lit and not flickering. Tweak them a little. If you cannot get both lights to come on you have bad sensors or the wiring to them.

Oct 12, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I replaced the gears in the craftman garage door opener. Now it only moves about a foot and immediately reverses!


DID YOU REINSTALL THE LITTLE "CUP" ON THE MOTOR SHAFT.

IT MUST BE INSTALLED AND PUSHED UP SO THAT IT IS PICKED UP BY THE RPM SENSOR.

THIS WOULD GIVE YOU WHAT YOU DESCRIBE.

Jun 07, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

My Sears Craftman garage door opener closes about 1/3,stops,and reverses.When I activate the remote again it stops rising,starts down again, comes down another foot or so,stops,reverses etc.,etc,etc It...


If the main light is flashing 10 times when the door reverses it is a door sensor problem. One may have been bumped so that they no longer point at one another. Make sure the small light on each sensor is lit and not flickering. If this isn't the case you might need to increase the down force a little. The control is on the back panel near where all those white wires go. Increase it about 1/4 turn and try.

Dec 16, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Sears Craftman Garage door opener model # 41a3493-1. Does it have auto reverse?


That isn't the model number you give it is the part number for the logic board. The model number is on the opposite end of the motor unit and starts with 139. If you are asking if the opener should reverse when it hits an obstacle the answer is yes. If it doesn't it is not adjusted correctly or is faulty.

Dec 01, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door closes and then opens immediately.


On the back of the motor unit you will find a control 'down force'. Turn this about 1/4 turn and try. This is for the reversing after moving a foot or so. Do not increase this control too much as it affects the safety.

If the door is hitting the floor and then reversing you will need to adjust the 'down limit' which is on the side of the motor unit. It takes a small screwdriver and you need to turn this control in the opposite direction of the arrow printed on the cover. Some tweaking will be necessary and remember if you run the motor too much a thermal switch will shut it off and you will have to wait 15 to 30 minutes for it to cool. This is normal so you will not be hurting anything.

Oct 27, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

My garage door bucks like a bronco


You have a door problem. The reason the door is reversing to the open position is because when it bucks the safety senses something wrong. Release the door from the opener and operate it by hand. You should find something.

Jun 23, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Craftman garage opener


The blinking LED is sending the code for "RPM sensor or motor overload. It isn't the motor or it wouldn't run at all. The RPM sensor is a small printed circuit board near the front of the motor. It will be available at Sears or any good door opener service company.

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

2 Answers

I have a problem with my 1/2 craftman garage opener


Realign safety eyes. A Led will be lit on each eye if aligned properly. they have to point directly at each other

May 15, 2009 | Sears Craftsman LiftMaster Chamberlain...

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