Robot vacuum avoids dark-colored rugs or refuses to cross dark floor patterns.

Safety first: Turn off the robot before cleaning sensors.

• Clean cliff sensors: Wipe the underside cliff sensor windows with a microfiber cloth.
• Improve lighting: Increase ambient light in the room to help sensors distinguish surfaces.
• Adjust environment: If possible, relocate very dark rugs or use boundary strips to prevent the robot from attempting to cross them.
• If problem is severe: Sensor calibration may be off. Professional service can test and, if needed, replace the cliff sensor array.