- Robot vacuums
- Robot vacuum
Error 16
iRobot Error 16 on Roomba: bumped or tilted at start
Risk level
Low
Usually safe to check without specialist tools.
Urgency
Low
Quick answer
Roomba says Error 16: it cannot start because it is tilted or the bumper may be dislodged. Check the bumper, move the robot to a flat surface and press CLEAN without moving it; if it persists, reboot it as iRobot describes.
Safety first
Stop and check this first
- Do not pry the bumper off or open the robot to refit it: the bumper sensors and lithium battery are inside the body. Leave that to iRobot or authorized service.
Safe checks you can perform
- Look at the bumper
- Start on a flat surface
- Reboot the robot
Leave these tasks to a qualified professional
- Do not attempt this professional task: Bumper and bump sensor check
- Do not attempt this professional task: Warranty review with iRobot Customer Care
What a technician must be able to justify
A technician is coming
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Bumper and bump sensor check
What they doiRobot service or an authorized repairer refits the bumper and tests its sensors with the robot opened and the battery disconnected.
They must show youthe bumper fault before repair.
In writingwhether the bumper was refitted or replaced and the part reference.
Warranty review with iRobot Customer Care
What they doiRobot Customer Care reviews the case with the robot charged, its serial number and proof of purchase.
They must show youthe case number.
In writingwhether the repair is covered.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Checks and evidence, step by step
Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
- 1
Look at the bumper
No special tools
Procedure
- Who:
- you.
- How:
- check whether the bumper is dislodged from the robot: look at both sides and press it gently to see that it moves and returns evenly.
- Result that matters:
- whether the bumper sits evenly and springs back.
- If it is clearly out of place:
- contact iRobot for the bumper steps rather than forcing it.
- If it sits evenly:
- go on to the flat surface test.
- Evidence to keep:
- a photo of both sides of the bumper.
Evidence: Roomba®: Error 16
- 2
Start on a flat surface
No special tools
Procedure
- Who:
- you.
- How:
- move Roomba to a flat surface and press CLEAN, without moving the robot while you press the button.
- Result that matters:
- whether it starts cleaning without Error 16.
- If it starts:
- the tilt or the movement at start was the cause.
- If it repeats on a flat surface:
- reboot the robot.
- Evidence to keep:
- a note of where it was started.
Evidence: Roomba®: Error 16
- 3
Reboot the robot
No special tools
Procedure
- Who:
- you.
- How:
- press and hold CLEAN for 10 seconds until all indicators light and release it to hear a series of tones; press and release CLEAN once, wait five seconds, then press CLEAN to start a new job. Then check your schedule in the iRobot HOME App.
- Result that matters:
- whether the robot starts normally after the reboot.
- If it starts:
- the reboot cleared the fault.
- If Error 16 persists:
- contact iRobot Customer Care.
- Evidence to keep:
- a note of the reboot time and result, and the serial number.
Evidence: Roomba®: Error 16
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- Robot vacuums
- Brand
- iRobot
- Product type
- Robot vacuum
Known code variants
- Error 16 level floor
- Error 16 Roomba i Series
- iRobot Error 16
- Place and start the main unit on a level floor
- Roborock Error 16
- Robot bumped upon start
- Roomba Error 16
What it means
In iRobot's i Series chart, Error 16 means the robot bumped upon start and the bumper is possibly dislodged; the Error 16 article adds that it may be tilted. At start the robot checks the bumper switches and its own position, so a bumper knocked out of place, a start on an uneven spot or moving the robot while pressing CLEAN can trigger it. The code does not prove the bumper or its sensors are broken: iRobot first asks for a flat surface and a reboot.
Warnings and stop conditions
- Loweditorial warning
Do not pry the bumper off or open the robot to refit it: the bumper sensors and lithium battery are inside the body. Leave that to iRobot or authorized service.
Evidence: Roomba®: Error 16
Symptoms and causes
Probable causes · in order
- Bumper dislodgedCommon
The bumper sits unevenly, one side sticks out or it does not spring back when pressed.
Evidence: The Roomba i Series Error Messages Chart · Roomba®: Error 16
- Tilted start positionCommon
The robot was started on a rug edge, threshold or slope and starts normally on a flat floor.
Evidence: Roomba®: Error 16
- Robot moved while pressing CLEANPossible
It only happens when the robot is held or nudged as CLEAN is pressed; iRobot asks you to avoid moving it.
Evidence: Roomba®: Error 16
Virtual technician
Does Error 16 still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
- 1
The Roomba i Series Error Messages Chart
iRobot · 2026 · official_doc
- 2
iRobot · 2026 · official_doc
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