The red light on the escalator is always on.

The light curtain is out of place. When the door is closed in place, the light curtain will light up in red, and the door lock or travel switch will open a few millimeters before the door is closed in place. When the door lock is opened, the elevator will start running. When the elevator is running, even if the light curtain box lights up red, the elevator will not open the door. This is just a situation. The maintenance light is always on, indicating that the maintenance status has not been lifted, and it is necessary to check what is wrong with the maintenance circuit.