Set a safety ladder under the garage door opener.
Garage door falls back down.
I have had it serviced twice spring tension and limits adjusted by local overhead dealer but problem persists.
Typically this happens because of springs that have become too loose or cables that are broken.
Locate the limit switch adjustment either on the back of the opener or behind the light bulb s lens cover.
When the door opens it sometimes falls back down part way.
Another cause of this problem is poorly installed springs and cables or a damaged garage door track.
The garage door can fall too quickly as a result of springs that have become too loose.
It goes partway down reverses direction and goes back up again.
If the garage door suddenly comes crashing down and will not go back up this is usually the result of a snapped cable.
Some models have two screws labeled.
This is almost always the result of a dirty.
It hits top then bounces back down rather than stopping in fully open position.
When your garage door falls too quickly it is a symptom that something is loose of broken.
It can also be due to to cables that are broken.
Also it could be due to springs and cables that have been poorly installed or a damaged garage door track.
The cables experience wear and tear after years of helping to control the movement of the door and the tension of the springs.