Charging error twenty-one (21) indicates the robot is on the Home Base/Clean Base®, but it is losing charge instead of staying charged up. The most common cause is that the Home Base/Clean Base® contacts need maintenance.
To resolve this issue, please start by cleaning the charging contacts:
- Unplug the base and wait 60 seconds.
- Remove the robot from the charging station and place the robot upside down on a flat surface.
- Grab a lightly dampened melamine foam, such as a Magic Eraser, or a lightly dampened cloth.
- Clean the metal charging contacts on your robot and dock. They should have a visible shine.
Home Base Charging Contacts
Robot Charging Contacts
Clean Base Contacts
Note: Damaged contacts could also prevent your robot from charging. If the contacts are green or copper colored, they are damaged and the robot or base with the damaged contacts needs to be replaced.
Make sure power is going to the Home/Clean Base® by checking the power cord connections, both on the wall and on the Home/Clean Base®. Unplug both connections and plug them back in.
If the issue persists, the most likely cause is that the battery has not been properly installed, so power is not reaching the battery. Please remove and reinstall the battery from the robot to clear the charging error 21.
If the error persists after following all the steps outlined above, contact iRobot Customer Care for additional assistance.
For expedited service, please have the following ready:
• Your robot charged and with you.
• Your robot's Serial Number.
• For warranty claims: Proof of purchase (receipt or invoice for purchase from an authorized retailer).
