Robot vacuum shows E6 and stops, often near stairs or dark carpets.

Safety: Turn OFF the robot and remove it from any elevated surfaces.

• Locate cliff sensors: These are usually small windows on the underside near the front edge.
• Clean sensors: Wipe each sensor window gently with a dry microfiber cloth. For stubborn dirt, use a slightly damp cloth and dry immediately.
• Test on different floor: Place the robot on a light-colored, non-reflective hard floor and start a cleaning cycle to see if the error clears.
• Check for damage: Inspect the underside for cracks or impact damage around the sensors.
• If E6 remains: The cliff sensor module may be defective or disconnected internally. Replacement requires opening the bottom cover and should be done by a technician.