This is almost always the result of a dirty or obstructed safety feature.
Garage door contact reverse.
You push the button to close the garage door.
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When the controls on the opener are adjusted the reversing mechanism will work properly.
However many modern day openers are not adjusted properly and thus many garage doors do not stop when an object is in their way.
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Adjust the reverse control until the door begins to reverse as soon as it comes into contact.
It should reverse immediately upon striking the obstruction.
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To decrease the amount of force required to reverse the direction of the garage door turn the knob or screw with a screwdriver counterclockwise one quarter.
It goes partway down reverses direction and goes back up again.
A garage door auto reverse is pretty much what it sounds like a system which forces the door to quickly reverse if it encounters an obstacle like your call us.
Re test the auto reverse function and repeat this process until your opener is properly adjusted.
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