Opener motor runs but the garage door does not move; chain or belt moves along the rail but the door stays put.

Safety first: Keep clear of the door while re-engaging the opener. Ensure the door is fully closed or securely supported.

Steps to restore connection:

• 1. Check emergency release: Look at the trolley on the Stanley rail. If the red release handle is hanging down and the trolley is in the disengaged position, it will slide freely without moving the door.
• 2. Re-engage trolley: With the door closed, pull the red handle toward the opener to reset the latch. Then run the opener until the trolley clicks back into the carriage, or manually push it until it locks.
• 3. Inspect door arm: Verify the curved opener arm is securely bolted to the door bracket. Replace any missing clevis pins or bolts with proper hardware and secure with cotter pins.
• 4. Check trolley teeth: If the trolley carriage is stripped and does not lock onto the chain/belt, replace the Stanley-compatible trolley assembly.