Broken Spring Replacement
That loud bang you heard from the garage โ that was almost certainly a torsion spring snapping. When it goes, the door is not safe to use. The spring is what carries the weight of the door. Without it, every pound โ usually 150 to 300 pounds โ falls on the opener motor and lift cables. They are not built for that. Using the door after a spring breaks causes more damage and costs more money. We carry spring sets for every standard Lebanon residential door. Most spring replacements done in under an hour, in a single visit. We always replace both springs at the same time.