Roomba: Charging Error 4 or 5
Too little current (or none) is reaching the battery from the dock or the robot, so charging has stopped.
Applies to: Roomba 500 to 900 series, e, i, j and s series. What you notice: red light, steady (solid); error number 4 or 5. This number is iRobot’s; on another maker’s robot the same number means something else.
What iRobot says to do
- Clean the charging contacts on the robot and on the dock.
- If that does not fix it, contact iRobot Customer Care: its agents use the charging error number to decide the next step.
Source
iRobot’s own support page or manual, read on the date shown.
- iRobot Customer Care: Charging Error Chart: All Roomba® and Braava® Models — Roomba 500 to 900 series, e, i, j and s series, and Braava m series (Charging Errors 1 to 21). 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.