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One-way crossings can happen when a doorway has different heights on each side or a door moves during cleaning. Inspect the return route separately from the entry.
Table of Contents
Start with these checks
- Measure the threshold from both rooms rather than from one side.
- Check the door remains held open and does not narrow the exit.
- Test the return crossing under supervision before relying on an unattended schedule.
What this looks like at home
A robot may descend a small lip into a conservatory but fail to climb the sharper edge on the way home.
Measure the profile in both directions
| Check | What matters |
|---|---|
| Rise | Measure from each side of the doorway. |
| Shape | Note sharp edges, slopes and narrow crests. |
| Return | Confirm the robot can get back to its charger. |
A mistake to avoid
Do not assume a successful entry proves the route back to the charger is safe.
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 non marking door stop. These are search results, not a verified recommendation for your particular machine.
What the result tells you
Watch whether the return failure involves a sharper lip, a moving door or an altered approach angle. Fix the specific route issue before assuming a larger advertised climbing figure would solve the whole problem.
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.