Hello Sandra
Thank you for your question. All our products are equipped with fall sensors. Your Roomba e5 has 4 such sensors on the underside which detect stairs or other fall hazards. So as soon as your robot encounters such a precipice, it will turn around again.
If you have any problems, please contact us directly. Our customer service and service centre in Vordemwald, AG can be reached during office opening hours, e.g. under the number +41 62 746 06 74. We look forward to hearing from you and are sure that we can help you with your request.
Best regards,
Your iRobot Team

With us he recognises the stairs!