If the roller will not be supported by a stopper it would only shut back since the spring is broken and can no longer support the door s heavy weight.
Manual two spring garage door broken.
Even though some garage doors have more than two springs in the operation system.
The garage door may be using a one spring system or a two spring system.
Two ladders 6 foot or higher these two ladders serve as stoppers when the roller is fully opened.
The size of the door and the type of spring system determines how difficult opening the door will be.
All though some openers can lift the door you risk damage to the operator and the door.
The herky jerky motion is especially common with garage doors equipped with extension springs.
Some garage door openers are strong enough to lift a door with only one good spring.
A garage door that has a broken spring has nothing to support its weight.
Important things needed to open a garage entry with broken spring.