Garage door opener runs, but door does not move because trolley is not attached to door arm.

Safety first: Ensure the door is fully closed or securely propped before reconnecting the trolley.

Steps to resolve:

• Check emergency release: Verify the red release handle is in the engaged position (usually pulled down and toward the opener). Slide the trolley until it clicks back into the carriage.
• Inspect door arm connection: At the top section of the door, confirm the curved door arm is securely bolted to the door bracket and the straight arm is pinned to the trolley.
• Replace missing hardware: Install new clevis pins and cotter pins where missing. Tighten loose bolts on the door bracket.
• Test operation: Run the opener and confirm the trolley now moves the door smoothly.