Robot vacuum does not detect stairs and may approach edges dangerously close.

Safety first: Do not operate the robot near stairs until the issue is resolved. Use physical barriers if necessary.

• 1. Clean cliff sensors: Wipe each underside sensor window with a soft, dry cloth.
• 2. Test over a dark mat: Place a dark mat or cloth on the floor and run the robot toward it. It should treat it like a drop and avoid it.
• 3. Improve lighting: Ensure the area near stairs is adequately lit during cleaning.
• 4. If detection remains unreliable: The cliff sensor modules may be weakened or damaged and should be replaced as a set to maintain consistent performance.