Roomba: Error 18
The robot finished cleaning but could not dock on the Home Base.
What the robot says: Docking problem. Place on the Home Base to charge
Applies to: Roomba i Series. What you notice: red light, steady (solid); error number 18; a spoken message. This number is iRobot’s; on another maker’s robot the same number means something else.
What iRobot says to do
- Put Roomba on the Home Base to charge, as it says.
- If the message persists, contact iRobot Customer Care.
Source
iRobot’s own support page or manual, read on the date shown.
- iRobot Customer Care: The Roomba i Series Error Messages Chart — Roomba i Series. homesupport.irobot.com Checked 2026-09-29.
The same number on other robots
Listed apart on purpose: each is that maker’s own code, not this one.