Opener runs but the door does not move; trolley carriage moves along the rail without pulling the door.

Safety first: Keep hands clear of the rail and trolley while operating the opener.

• Step 1 – Check emergency release: Ensure the B&D trolley is re‑engaged. Pull the release cord toward the opener head and run the opener until the trolley clicks back into the carriage.
• Step 2 – Inspect door arm: Verify that the door arm is securely attached to both the trolley and the door bracket with proper pins and fasteners.
• Step 3 – Examine trolley teeth: With power off, slide the trolley along the rail and inspect for broken or stripped engagement teeth. Replace the trolley carriage if worn.
• Step 4 – Test operation: After re‑engaging and securing hardware, run a full open/close cycle and re‑set limits if necessary.