iRobot Roomba · supported i-series robots
iRobot Roomba Error 99: Robot lost navigation landmarks
Editor: Feroz Sheikh · Updated · How we verify
Robot lost navigation landmarks.
Manufacturer source checked 2026-10-01. Match the entire message and exact model family before following a fix.
What this message means
Moving the robot or changing the environment during a run can leave it without usable landmarks. This can end a job without proving that a consumable is worn.
Checks in order
- Restore normal dock placement and stable room access.
- Retry from the dock; review saved-data consequences before using the manufacturer map workflow.
How to decide whether the check worked
Run one short supervised retry after the permitted checks. Compare the exact warning with the original message. A different warning needs its own instructions. If the robot completes the attempt, observe the next normal job; one successful retry does not prove that damaged hardware has been repaired.
Write down whether the same message returns immediately, only during cleaning, or only while docking. Keep the robot model and software version with that observation. A short recording of the visible message can help manufacturer support distinguish a repeated fault from another warning; keep serial numbers and personal information out of anything shared publicly.
Does this require a replacement part?
A software, mapping or communication warning does not establish a consumable failure. Complete the supported checks before considering hardware. Manufacturer diagnosis is needed for recurrence; a brush, filter or battery listing cannot prove the cause.
Use the part links below to check the original identifier, exact model, source market and written fit caveat. The error message itself does not confirm that a seller's replacement fits. An unverified or excluded relationship has no shopping button. If the part is a battery, charging component or sealed motor, use the manufacturer service route rather than adapting a similar assembly.
When to contact support
Contact the manufacturer if this exact warning returns after the listed checks or a component will not seat normally. Provide the model, complete message, when it occurs and the checks already performed. Let support decide whether a service assembly is required.
Stop the test if the robot is wet, unusually hot, smells abnormal, has a damaged cord or shows battery swelling. Do not disable cliff sensors, force a jammed mechanism or open a sealed electrical assembly to make the message disappear. Use a physical barrier around drops during any supervised retry.
Manufacturer evidence and related messages
Read the official iRobot Roomba support article or manual. This page provides an editorial troubleshooting explanation; it does not claim a physical repair test.