do all the work to raise your garage door. The opener merely moves the
door. When springs weaken or break the door becomes too heavy for the
opener to lift it. Even if you disengage the door from the opener it
will be too heavy for the average person to lift. All springs on your
garage door should be replaced when any one of them fails.
There are two types of springs on garage doors. Sectional roll-up doors have torsion springs (springs that twist) or extension springs (springs that stretch). Tilt-up doors (also called one-piece, slab, and California doors) have only extension springs.