What should I check when a robot vacuum repeatedly misses one room?

Start with the saved map rather than assuming the vacuum has a fault. Open the map in the app and check that the room appears, its label is sensible, and its boundaries do not accidentally leave it outside another room or merge it with a neighboring area. iRobot’s guidance for the models and app features it covers specifically recommends checking physical access and whether room dividers and labels are correct. [S2]

Next, look at the actual task settings: confirm that the missed room is selected, rather than relying on a whole-home or previously saved routine to include it. These are practical checks, not proof of what caused the miss. App names and controls vary, so use the instructions for your exact model when changing map settings.

Observe the room entrance during a normal run, without moving the robot or changing several things at once. Note whether it approaches the doorway, turns away, enters partway, or reaches the room but leaves an area untouched. Check for ordinary access obstacles such as a closed door or an item narrowing the route, and record whether the doorway or floor arrangement differs from earlier runs. Do not force the robot through a tight spot or block its sensors to test it.

A map can show a room even when the robot cannot physically get to its intended cleaning area; checking access is part of the iRobot guidance for the models and app features described there. [S2] If access seems clear but the robot still cannot complete the task, that guidance notes that a mapping run may help. [S2] Whether that is appropriate, and how to start one, depends on the specific model and app.

For the iRobot Roomba i3/i4/i5 models covered by its guide, directed room cleaning should start at the charging station, which acts as a localization point. The guide also warns that moving the robot mid-job can disrupt that task. [S1] So, if you are using directed room cleaning, check whether the robot began at its dock and whether anyone moved it during the run.

That instruction is specific to those models and task type; do not assume it applies to every robot vacuum or cleaning mode. The same guide says major layout changes or moving the dock call for deleting and remapping on the covered models. [S1] Before making that significant change, check the exact model’s current instructions and consider whether the map or dock was actually moved. The cited guidance does not establish that a dock or map change is the cause of every missed-room problem.

Keep a short, factual service note. Include the vacuum’s exact model, app or map version if readily shown, the room name as displayed, and the cleaning mode used. Record the date of a recent attempt, whether the robot started from its dock, whether it entered the room, and the point where it appeared to turn away or stop. Note relevant changes, such as a moved dock, changed room layout, or newly blocked doorway. Avoid guessing at a cause; label it as an observation or question.

For example: “Model: [model]. Room label: [label]. Task: [selected-room / whole-home]. Start point: [dock / other]. Observation: [approached doorway but did not enter]. Recent changes: [none / describe]. Map question: [check boundary or remapping instructions for this model?].” Share only information support requests through its official channel, and do not include passwords or unrelated personal details.