What Causes Elevator Doors to Reopen?
What It Is
Elevator doors sometimes begin closing and then reopen unexpectedly.
How Elevator Doors Work
Elevator doors are controlled by motors and safety systems.
The system monitors movement continuously.
Why Doors Reopen
Sensors detect objects in the doorway.
The system stops and reverses the doors.
Types of Sensors Used
Light beams run vertically along the door frame.
Breaking the beam signals an obstruction.
Other Safety Triggers
Door resistance can trigger reopening.
System checks may also reset the doors.
Common Examples
- Doors reopening when someone steps in late
- Doors reopening with bags or carts nearby
- Repeated reopening in busy buildings
Closing Summary
Elevator doors reopen when sensors or safety systems detect an obstruction or resistance.
