What are the common reasons why my garage roller door won't open?

Common reasons why your garage roller door, which rolls up into drum above opening rather than sectional door that goes along tracks, won't open include power issues, mechanical binding, and spring failure similar to sectional doors but specific to roller design. The most common reason is broken torsion spring or spring inside roller drum that counterbalances door weight, as when spring breaks, door becomes too heavy to lift manually or with motor and may not open, requiring professional spring replacement costing 200 to 400 dollars due to high tension. Power loss due to unplugged motor, tripped breaker, or GFCI prevents opener from lifting roller door, so check if motor has power. Manual lock or latch on roller door engaged prevents opening and must be disengaged. Door off guides or tracks due to hit or debris binding prevents roller door from rolling up, as roller doors run in vertical guides and if guides bent or dirty, door jams. Motor failure, logic board failure, or capacitor failure in roller door opener prevents operation, with motor humming but not moving. Remote battery dead, remote not programmed, or lock mode engaged disables remote operation. Safety sensors or safety edge sensor on bottom of roller door that detects obstruction can prevent opening if misaligned or damaged. Extreme cold can cause door to freeze to ground. Try opening manually by using manual override handle or chain, and if door won't lift manually or is very heavy, spring likely broken. Lubricate guides with silicone lubricant and keep guides clean to prevent binding.