The short version
- 01Put the robot back on the Home Base by hand so it can re-establish its position.
- 02Keep the doors it needs open for the whole run, not just at the start.
- 03Give the Home Base clear space either side and in front of it.
- 04Leave enough light for models that navigate visually.
- 05Check whether the room changed since the map was made, and remap if it did.
- 06Read the exact number: 18, 19, 41 and 99 are different failures in the same family.
Raw message
Error 17 — Navigation problem. See the app for help
Likely causes
- The robot entering an unknown area and losing track of where it is.
- A door closed behind it, so the route back to the Home Base no longer exists.
- Furniture moved since the map was built, removing the landmarks it navigates by.
- Low light, which affects models that navigate visually.
- A Home Base that has been moved, or that is obstructed.
Five errors about the room, not the robot
iRobot’s i Series chart groups a set of navigation and docking failures that are easy to confuse. Error 17 is a navigation problem: the robot entered an unknown area and got lost while cleaning, and was unable to return to the Home Base. Error 18 is a docking problem — cleaning finished but the robot could not dock. Error 19 is an undocking problem, where it failed to leave the Home Base and may have bumped something near it.
Two more belong with them. Error 41 means the mission timed out before completion, with the instruction to press CLEAN to restart. Error 99 appears as “incomplete” in the mission report, and iRobot describes it as the robot being unable to orient itself from known landmarks, so it could not complete cleaning and cancelled the job.
What unites them is that none describes a broken part. These are the robot reporting that the environment did not match what it expected — which is why the fixes are about the room, the doors and the Home Base rather than about cleaning anything.
Getting it back on the map
The first move after any of these is to put the robot back on the Home Base by hand. A robot that has lost its position cannot reliably find its way home, and returning it to the one place it knows lets it re-establish where it is before the next run.
Then look at what changed. iRobot names the robot entering an unknown area, which in practice usually means a door that was open when the map was built and closed during the run, or open when it should have been shut. A robot that wanders into an unmapped room has no landmarks to work from.
Furniture matters more than people expect on models that navigate by landmarks. A room rearranged since the map was made can remove the features the robot orients by, and error 99 — unable to orient itself based on known landmarks — is precisely that failure. Remapping after a significant rearrangement is the fix.
The Home Base, and the errors either side of docking
Errors 18 and 19 point at the dock rather than the route. 18 is a failure to dock at the end of a job; 19 is a failure to undock at the start, which iRobot attributes to bumping something near the Home Base.
Both usually come down to clearance. A Home Base pushed into a corner, against a rug edge, or with objects close on either side gives the robot too little room to line up on approach or to reverse out cleanly. Clearing space around it resolves more docking errors than anything done to the robot.
Two related codes are worth knowing. Error 43 is the robot starting in the Home Base with the infrared halo off the base, and error 1010 is the robot being unable to make a path back to the dock — both dock-relationship problems rather than faults.
If the message persists once the room and the dock are sorted, iRobot’s instruction is to contact Customer Care with the robot charged and to hand, its serial number ready, and proof of purchase for a warranty claim.
Sources and review notes
Checked on . Based on iRobot’s published error message chart for the Roomba i Series, which defines errors 17, 18, 19, 41, 43, 99 and 1010 and their causes. The grouping of them as environment rather than hardware problems, and the advice about doors, furniture and dock clearance, are editorial. Codes differ by series — these are i Series numbers. iRobot’s support pages render only in a browser and cannot be checked by automated fetching. Glitchary is independent of iRobot.