When door is attached it will not open. will work properly when door is not attached
There is a trip lever along the garage door track.
When door goes up, it trips the lever and turns off the opener.
The trip lever is adjustable. Loosen it and move back 1" or so.
If that is not far enough, move it back 1/2" more.
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Loosen the chain enough
so that you can remove it from the sprocket above the motor unit.
With the door closed run the motor until the sprocket turns clockwise
and stops. With everything attached replace and tighten the chain.
Some adjusting of the up and down limits will probably be required.
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