If your garage door springs are broken, which is common failure where torsion spring above door or extension springs along sides snap, you need to take safety precautions and arrange professional replacement, as broken springs make door too heavy to lift and are dangerous to repair DIY. First, stop using automatic opener, as opener cannot lift door with broken spring and will strain motor, causing opener failure, so disconnect opener by pulling emergency release cord, usually red cord hanging from trolley, to allow manual operation. Do not try to open door repeatedly with opener, as it can cause opener gear to strip or door to fall. If you need to get car out, you can manually lift door with help of another person, as broken spring makes door weigh 150 to 300 pounds, so lift with caution, keep door from falling, and prop it open with ladder or clamp to prevent it slamming down, as door can fall rapidly without spring counterbalance. Secure door closed if you leave, as door may be heavy and not stay closed. Call professional garage door company to replace springs, as torsion springs store high tension and require special winding bars and knowledge to replace safely, with professional replacement costing 200 to 400 dollars for single spring and 300 to 600 dollars for pair, and recommend replacing both springs if one breaks since they have same age. Do not attempt DIY spring replacement due to injury risk. Keep gutters above garage clean to prevent water damage that can cause rust and premature spring failure.
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