iRobot · Robot Vacuum Minor

Error 16 — Bumped at startup

Robot's accelerometer detected motion or impact when the cleaning cycle started.

Keep using it?
Yes — fix when convenient
DIY difficulty
Easy
Verified against
homesupport.irobot.com ↗

How to fix it

  1. Place robot on a flat, hard floor away from walls and furniture.
  2. Wait for it to fully settle, then press CLEAN.
  3. If error repeats, clean the cliff sensors on the underside with a dry cloth or Magic Eraser.
  4. Ensure no objects are touching the bumper at startup.

Why it happens

Typical signs: 'Error 16, place Roomba on a flat surface' · Error happens immediately after pressing CLEAN · Common after being picked up

  • Robot moved/bumped at start It was bumped, tilted, or picked up just as CLEAN was pressed.
  • Not on level surface Started on uneven flooring or stuck against an object.
  • Dirty cliff sensors Cliff sensors falsely triggering at startup.

More iRobot robot vacuum codes

Charging Error 2 Charging Error 2 — Battery not detected Charging Error 3 Charging Error 3 — Battery won't charge Charging Error 5 Charging Error 5 — Low current fault (dirty contacts) Error 1 Error 1 — Side wheel stuck / off ground Error 10 Error 10 — Right wheel sensing problem Error 11 Error 11 — Vacuum motor not activating

All iRobot codes → All robot vacuum codes →

Frequently asked questions

What does the Error 16 code mean on a iRobot robot vacuum?

Robot's accelerometer detected motion or impact when the cleaning cycle started.

What causes the Error 16 code on a iRobot robot vacuum?

Robot moved/bumped at start: It was bumped, tilted, or picked up just as CLEAN was pressed. Not on level surface: Started on uneven flooring or stuck against an object. Dirty cliff sensors: Cliff sensors falsely triggering at startup.

Is it safe to keep using a iRobot robot vacuum with a Error 16 error?

Yes — fix when convenient. This is rated a minor-severity fault.

How do I fix Error 16 on a iRobot robot vacuum?

Place robot on a flat, hard floor away from walls and furniture. Wait for it to fully settle, then press CLEAN. If error repeats, clean the cliff sensors on the underside with a dry cloth or Magic Eraser.

Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician. Verified against manufacturer documentation: homesupport.irobot.com.