Dyson False cliff detection

Robot vacuum stops at the top of stairs or edges and refuses to move forward, even on flat surfaces near dark rugs.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Dirty or misaligned cliff sensors, Very dark or reflective flooring, Faulty cliff sensor board, Low ambient light

Safety first: Keep the robot away from actual stairs while testing.

Clean cliff sensors: Wipe the underside cliff sensor windows with a dry cloth.
Test on light floor: Place the robot on a light‑colored, non‑reflective floor and start a clean. If it moves normally there, your dark rug may be triggering the sensors.
Adjust environment: Increase room lighting or move very dark rugs if possible.

If the robot still refuses to move forward on normal flooring, the cliff sensor board may be faulty and require replacement.

Medium 3/5

Cliff sensor board

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