garage door won't reverse on hitting object

retire2September 23, 2011

Installed a Craftsman 1/2 HP chain drive opener on a 8 foot wide by 7 foot high metal sectional door. The door will reverse at mid level if I grasp the door as it goes down. However, the light will not blink as it is supposed to according to the instructions. I have adjusted the down force to the max and it will not blink. At max force the door pushes up the track. I changed the max force back so that the door will reverse and the light will not blink. Now if I place the 2 x 4 on the floor and close the door the door will stop on the board and will not reverse. What should I do.

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What is the model number?

    Bookmark   September 24, 2011 at 9:40AM
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The model number is 139.53920DM.

    Bookmark   September 24, 2011 at 6:51PM
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The lights do not blink when the door meets an obstruction only when something breaks the beam between the door sensors. Back off the down force until the door will not close and then increase the down force only enough that the door will close consistently. If the door still doesn't reverse on the 2 x 4 and the opener is still in warranty call Sears. It doesn't matter that you installed it yourself.

    Bookmark   September 26, 2011 at 9:50AM
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On page 28 of the manual under the heading "How and when to adjust the forces" Item 1 (Test the DOWN force bullet 2 (If the door reverses during the down (close) cycle and the opener lights aren't flashing ...) I read this as the lights should flash. I increased the force in small increments until I reached the max limit and couldn't get the lights to flash.

Do you think the closer is defective or do you have any other suggestions?

    Bookmark   September 26, 2011 at 7:56PM
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You are reading it wrong. The door will reverse under two conditions. One is if the door meets an obstruction or the door is binding. It will simply reverse to the open position. The other is if there is something blocking the beam between the door sensors. The door will then reverse and the main light will flash 10 times. This helps with diagnosis.

    Bookmark   September 27, 2011 at 9:13AM
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