Goods Scene Troubleshooting
iRobot All Roomba Charging Error 20 – Battery fault detected
Charging Error 20 indicates that the robot has detected a battery fault.
Issue meaning
What this issue means
Charging Error 20 indicates that the robot has detected a battery fault.
Start here
First checks
Confirm that an authentic iRobot lithium-ion battery is installed. Remove and reinstall the battery, then retry charging. If the error persists, contact iRobot support.
Inspection
Area to inspect
Battery pack, battery seating and battery contacts.
Goods Scene guidance
What to do next
Treat this as a battery-side diagnostic first. Reseat the battery and confirm the correct battery before investigating robot charging hardware.
Practical guidance is kept separate from manufacturer wording.