Yes, you can manually open garage door when spring breaks that counterbalances door weight, but it will be very heavy and requires caution, assistance, and temporary propping, as broken spring makes door difficult to lift. When torsion spring above door or extension springs along sides break, they no longer counterbalance door weight of 150 to 300 pounds, so door becomes heavy. To manually open when spring breaks, first ensure door is not locked with manual slide lock on track, which must be disengaged. Disconnect garage door opener from door by pulling emergency release cord, usually red cord hanging from trolley, down and toward door, allowing door to be operated manually without opener. You will need at least two strong people to lift door, as it is heavy, standing on both sides and lifting evenly from bottom with legs, not back. Lift slowly and keep door level to prevent off-track. Once open, prop door securely with ladder, clamp on track, or locking pliers to prevent it from falling, as without spring door will not stay open and can slam down causing injury. Do not leave door open unattended without securing. Lower door slowly with help when closing. Do not use opener to open door with broken spring, as opener will strain and may fail. Manually opening with broken spring should be temporary until professional replaces spring costing 200 to 400 dollars for single and 300 to 600 dollars for pair, as springs store high tension and DIY replacement is dangerous, requiring special tools and professional service for safety.
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