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On some models, a dark surface can trigger cliff sensing because it reflects little light. This can look like an obstacle problem even in an empty room.
Table of Contents
Start with these checks
- Clean the cliff-sensor windows as the model manual directs.
- Compare a light floor and the dark rug under similar conditions.
- Check the manufacturer's advice for that exact model and use an exclusion zone if the issue persists.
What this looks like at home
If the robot reverses exactly at a black border but crosses the pale centre, surface sensing is a more useful lead than Wi-Fi.
Why a dark surface can be different
| Check | What matters |
|---|---|
| Colour boundary | Note whether reversal follows a specific dark edge. |
| Sensor condition | Clean only the exposed windows as directed. |
| Fall protection | Keep it active throughout troubleshooting. |
A mistake to avoid
Never cover cliff sensors to force a crossing, especially anywhere near steps.
Buy a part only after identifying the cause
Check the exact model and part reference before buying. If cleaning resolves the problem, a replacement may be unnecessary.
Browse Amazon UK results for handheld vacuum for rugs. These are search results, not a verified recommendation for your particular machine.
What the result tells you
Keep a photo of the rug pattern and a short recording of the reversal. If support confirms a model limitation, extra remapping or replacement brushes are unlikely to solve that particular surface interaction.
Related guidance
- Robot Vacuum Stuck? A Comprehensive Troubleshooting Guide
- Robot Vacuum Maintenance Tips UK: Keep Your Cleaner Running Smoothly
Sources and scope
Checked on 9 September 2026. Manufacturer instructions apply to the models they name; use your own exact manual for button sequences, removable parts and cleaning permissions. Product specifications are advertised claims. Examples illustrate decisions and are not hands-on test results.