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1/2 hp garage door opener stopped working. It went down 3/4 of the way then stopped, now it will not work at all. I hear the motor working but the chain will not move now. I manually unlocked and the door will move up and down and the sensor lights by the doors are green. I do not have a manual so I am not sure what to do. Some sites say that it might be the gear may be worn. Can someone help me? Also, I had a new garage door installed this summer so the springs how be fine.

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Posted on Jan 02, 2017

  • 244 Answers

SOURCE: GARAGE DOOR OPENS BUT WILL NOT CLOSE AUTOMATICALLY

is bulb on motor flashing 10 times. then you have electric eye problem. otherwise, sounds like you need to increase down force a hair. adjustement is on logic board, right knob.

Posted on Jan 15, 2009

  • 30 Answers

SOURCE: Garage door opener motor will not open garage door

It sounds like you did a really good job! My Craftsman 1/2 hp gar. dr. opener has a red reset button on it on the l/h side as you are looking at the light/motor from the garage door opening. You have to take the light cover off to be able to see it. My reset button is on the same side as the ground wire. You might check the ground wire while you're there. I really hope that this fixes it for you (and me). I'm quite sure it will as you know your way around the garage door opener already. Good Luck and Let me Know (Please) if it fixed it or not. If I think of anything else, I'll let you know. Have a Good Day!

Posted on Jan 16, 2009

  • 118 Answers

SOURCE: Garage door opener motor doesn't work.

2 flashes is a safety eye issue, but you problen is most likely that the chain is not sync with the limit setting. Take the bottom off the gear and sprocket assemble and rotate center limit srew until it is in the same position as the trolley.

Posted on Jan 30, 2009

  • 118 Answers

SOURCE: motor runs but door does not open

you have a stripped gear on your opener. Replace gear and sprocket kit

Posted on Feb 08, 2009

  • 3197 Answers

SOURCE: Craftsman 1/2 HP garage opener opens only 6 inches

Remove the cover and check the drive gear. It is white nylon and is just in front of the motor. It may be stripped. Take a close look at those door springs. They can sometime appear to be okay when one is broken.

Posted on Oct 10, 2009

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My garage door opener is a 3/4 craftsman and one light is yellow and the other is green. I put my hand in front of the green light and the green light went off. the other side is a yellow light and it


Hi Vickie,

The safety beam portion of the garage door opener is set up to stop the door from closing if something (car, person, etc,.) is in the doorway.

When the door is open - if you press the hard wired push button (not the wireless remote) the door will either close until shut completely, or begin to close and reverse direction as soon as you let go of the button. When this happens, it *usually* means that a sensor is blocked - and reversing the door motor. If you try yhtis with the remote the door may not move at all or just bump down and stop.

You should re-align the sensors as described in the link below. Good luck!


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The shaft on these garage door motors are not direct drive systems. You'll have to open up the box to see what the actual problem is. I have had stuff like this happen where a gear just slipped out of place.

http://www.aaadooropeners.com/?gclid=CLH3wt628p8CFVZS2goduwSLYQ

Here is a link for a parts supplier. I don't know your model but it looks like most of the Liftmaster worm screw gears and drive gears are plastic so it's possible that one of them has cracked.

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My Craftsman 1/2 HP Garage Door Opener stopped working. The motor is running but chain isn't moving. The actual door goes up and down fine.


Remove the cover and take a look. I'm sure you will find the drive gear is stripped. It is a white nylon gear just in front of the motor. You can buy one at any good door service company. The part number is 41A2817 and it comes with instructions.

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It sounds like it is out of alignment. The motor does detect excess pressure incase something or someone is underneath and the light sensor is not detecting anything. The pressure on the motor does change from when the door is all the way up to when it has the full weight of the door on the chain before it touches down. The spring offsets most of the weight of the door, but it still takes weight. Maybe when the motor is taking more of the weight, it is still shifting in a way to throw off the alignment. Also, you could disconnect the door from the chain, try manually moving the door and see how much weight the motor is taking at what points. Good luck!

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1 Answer

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Try this: Loosen the chain enough that you can remove it from the sprocket above the motor. Now run the opener until the sprocket turns in the clockwise direction and stops. Reconnect the chain. This will get everything in sync and you will have to tweak the 'up and down limits' a bit to get it just right.

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1 Answer

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above would not explain unit running in middle of night after door had been closed. I to would suggest taking off wire from motor (white and red). if problem stops, you have a short in wire or a bad pushbutton.

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The motor is probably either stalling because the door is too stiff, or you have a beam break detector that is being triggered when the door is halfway down.

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