How to close a garage door with a broken spring?

To close a garage door with a broken spring, you need to do so manually with caution, as door will be extremely heavy without spring counterbalance and can cause injury if it falls. First, ensure no one is under door and area clear. Pull emergency release cord, usually red cord hanging from trolley, to disconnect opener from door, as opener cannot lift heavy door and may be damaged if you try to use it with broken spring, so disengage opener. With broken torsion or extension spring, door weight is 150 to 300 pounds without counterbalance, so you need two people to safely lower door, one on each side, lifting slightly to disengage from open position and then slowly lowering door, maintaining control to prevent door from slamming down. If door is already open and you need to close it, have helpers support door weight and slowly lower it, keeping hands clear of tracks and pinch points. Once closed, engage manual slide lock on door track to secure door, as opener no longer holds door closed when spring broken. Do not try to open door again until spring replaced, as heavy door can cause back injury or damage. Call professional garage door service to replace spring, costing 200 to 400 dollars for single and 300 to 600 dollars for pair, as springs store high tension and dangerous DIY. Avoid using opener with broken spring, as it strains motor and can strip gear. If door is stuck open, you may need to secure it with clamps to prevent falling.