| Curtain is jammed in the guides | Slat, endlock, guide, bottom bar, barrel, or impact distortion | Curtain position, guide alignment, obstruction, impact history, and safe isolation | “The rolling curtain is jammed halfway in the guides; no one is forcing it.” |
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| Slats are bent after lift-truck impact | Curtain slats, endlocks, guide, hood, bottom bar, or wall attachment | Extent of deformation, coil condition, guides, and opening stability | “A lift truck contacted the lower right curtain; the door remains closed.” |
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| Bottom bar is twisted or will not seat | Bottom bar, endlocks, guides, floor, or curtain alignment | Bar geometry, contact surface, slat alignment, and operating boundary | “The bottom bar sits high on one side and does not seal the opening.” |
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| Curtain rubs one guide | Guide wear, barrel alignment, endlock, slat damage, or building movement | Guide channels, barrel level, curtain edges, and support points | “The curtain rubs the left guide on each cycle.” |
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| Door will not lift with chain hoist | Hoist, sprocket, counterbalance, curtain weight, guide, or jam | Hoist behavior, curtain support, tension, and obstruction without forced movement | “The chain hoist moves but the curtain stays down.” |
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| Motor runs but curtain does not move | Operator coupling, drive, shaft, barrel, brake, control, or jam | Operator output, shaft and barrel behavior, controls, and curtain load | “The motor runs at door 5 but the curtain does not lift.” |
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| Curtain drops, drifts, or rolls unevenly | Counterbalance, brake, tension, guide, barrel, or slat condition | Stored energy, stability, guide engagement, and safe shutdown | “The curtain began drifting while open; we stopped cycling it.” |
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| Fire door released or will not reset | Release device, fusible link, fire-door governor, curtain, or guides | Fire-door status and required testing pathway, not general service-door repair | “This is marked fire-rated and dropped; we need the fire-door testing route.” |
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