Safety: Garage doors are heavy and spring/cable systems can be under significant tension. Do not loosen or disassemble high-tension hardware unless you are qualified to do so.
Common Signs
A sudden loud snap, visible spring separation, a very heavy door, or a door that lifts only a few inches can indicate a broken spring.
Do Not Rely on the Opener
An opener is not designed to substitute for the counterbalance system when a spring has failed.
Professional Spring Service
Because spring components can be under high tension, repair and replacement should be approached as a specialized mechanical service.