A missed room can be blocked by a threshold, closed door, no-go zone, weak map connection, dark floor or insufficient battery to reach it. Compare the threshold height with the climb figure in the manual and watch the approach once.
What this covers
- Robot vacuums · mapping
What it does not cover
Differential
Likely causes of “Robot vacuum will not enter or clean one room”, and how to tell them apart
- 1
A threshold or door track is above the robot's climb limit
What separates it The robot reaches the doorway, nudges it and turns back, and the same happens on every run.
How to confirm Compare the threshold height with the climb figure in the manual and watch the approach once.
- 2
A no-go zone, virtual wall or closed door is excluding the room
What separates it The room shows as blocked or grayed in the app, or a door closed by the wind or a pet keeps it out.
How to confirm Open the app map and check no-go zones, virtual barriers and room names; check the door at the time of the run.
- 3
The robot runs out of battery before it reaches the room
What separates it The room is at the far end of the run and the robot heads back to the dock early.
How to confirm Time a run and see where the return happens; a large home may need a split into two runs.
- 4
Dark flooring or poor light is triggering cliff or navigation stops
What separates it The robot stops at the same place on the floor, and a nearby cliff-sensor warning appears.
How to confirm Wipe the sensors, brighten the room and check whether the manufacturer offers a carpet or sensitivity option.
Before you touch a setting
Record this first — changing settings destroys the evidence
- Where exactly the robot stops or turns back, and whether it reports a message at that point.
- The threshold height and floor color change at the doorway.
- Whether the robot cleans the room when you place it inside and start a run from there.
Try in this order
0 of 4 completedObserve before changing anything
ReversibleWatch the robot approach the doorway and inspect map boundaries and excluded zones.
Isolate the failing boundary
ReversibleRemove temporary obstacles, improve lighting if required and test from inside the room.
Apply the narrow correction
ReversibleEdit the map or threshold setup before deleting the entire map.
Verify the result and stop at the boundary
ReversibleDo not force the robot over a threshold outside its clearance specification.
Stop boundary
When this stops being a self-service repair
- !Do not force or lift the robot over a threshold higher than its clearance; that damages the drive wheels.
- !Do not tape over cliff sensors to make it cross a surface, because it will then drive off a stair edge.
Evidence ledger
Sources behind this answer
Exact questions
Common questions
Does starting the robot inside the room prove the room is cleanable?+
Yes, it tells you the room itself is fine and the fault is at the approach: a threshold, a zone or the battery reaching that far.
Why does it skip a room?+
A threshold, door or no-go zone.
What to check?+
Zones and thresholds.
Could sensors misread?+
Dark floors can.