This is almost always the result of a dirty or obstructed safety feature.
Garage door contact reverse.
However many modern day openers are not adjusted properly and thus many garage doors do not stop when an object is in their way.
To increase the amount of force turn it clockwise.
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Garage doors manufactured after 1991 are equipped with the auto reverse mechanism.
It should reverse immediately upon striking the obstruction.
It goes partway down reverses direction and goes back up again.
Adjust the reverse control until the door begins to reverse as soon as it comes into contact.
Press the control button to close the door.
When the controls on the opener are adjusted the reversing mechanism will work properly.
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.
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.
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