Irobot Roomba s Series Robot Vacuum Charging Error 121 Error Code

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What it means

The robot docked but was unable to maintain charging.

Try this first

Clean the robot charging contacts.
Clean the dock contacts.
Redock the robot.

Can I keep using it?🔴 Charging-system fault

Repair usually required?⚠ Battery, dock, or robot service may be required

If the error keeps returning

If Charging Error 121 remains after the recommended checks, use the iRobot app or contact iRobot support.

Official source

Troubleshooting information verified against manufacturer support documentation.

View manufacturer support page →

Safety note:ApplianceSignal provides general troubleshooting information. Always follow the appliance manufacturer's safety instructions and disconnect power when required.

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iRobot Roomba s Series Robot Vacuum Charging Error 121: Quick Answer

What it means: The robot docked but was unable to maintain charging.

First thing to check

Clean the robot charging contacts.

Can I keep using it?

Charging-system fault

Repair outlook

Battery, dock, or robot service may be required

If the code remains

If Charging Error 121 remains after the recommended checks, use the iRobot app or contact iRobot support.

Model note: Error-code meanings and procedures can vary by model and model year. Confirm the code against the documentation for your exact appliance before replacing parts.

Manufacturer reference: homesupport.irobot.com