← Full guide: Roomba Charging Error (Check the Code Before a Battery Swap)
Roomba Charging Error 3: charging system fault
Charging Error 3 means the charging system itself is not working properly.
Start here
Charging Error 3 means the charging system itself is not working properly. If a clean retry does not clear it, iRobot directs the owner to Customer Care because the robot may need replacement/service.
Check these first
- Confirm the dock has power.
- Check contacts for dirt or obvious damage.
- Retry charging once with the correct battery and no liquid-damage signs.
Fix it in this order
- Clean accessible charging contacts using the manufacturer-approved method.
- Retry on the known powered dock.
- If Error 3 remains, contact iRobot with the serial/error instead of opening the robot or replacing unrelated parts.
Evidence to keep
- Error recording
- Dock power test result
- Contact condition
- Battery/dock substitutions already tried
Do not make it harder
- Board-level cleaning as the first fix
- Repeated battery purchases
- Continuing after heat or liquid damage
How you know it is fixed
- Charging starts and Error 3 no longer returns across multiple dockings.
If the obvious fix does not work
- If another compatible dock changes nothing, the robot-side charging system becomes more likely.
- If the robot is in warranty, do not perform board-level DIY work that can complicate coverage.
If this still isn't resolved
- iRobot Customer Care / authorized service
Sources for this path
Use these references to confirm provider-, model-, policy-, or jurisdiction-specific details before an irreversible step.
Need the complete context?
This page solves one branch. The parent guide covers the full decision, edge cases, alternatives, and related checks.