Display shows 'E'; operator beeps or flashes but does not move.

Safety first: Ensure the door is safely supported and cannot fall. Keep hands away from pinch points.

Step-by-step:

• Check emergency release: On Hormann operators, pull the red release cord toward the door to disengage, and move the carriage to the engagement position. To re-engage, move the door manually until the carriage clicks back into the drive shuttle, or follow the specific re-engagement instructions.
• Inspect door arm: Confirm that the curved or straight door arm is firmly bolted to the door and to the carriage bracket.
• Test: Once re-engaged, apply a command. The door should move with the operator. If the carriage will not lock, the release mechanism may be broken and require replacement.