The red light of the elevator door bypass is always on, that is, the light curtain is misplaced. According to relevant public information, only when the door is closed in place will the light curtain light up in red, and the door lock or travel switch will be opened 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 there is something wrong with the maintenance circuit that needs to be checked.