Goods Scene Troubleshooting
iRobot Charging Error 120 – Battery fault or not ready to charge
Charging Error 120 means the battery has a fault or is not ready to accept a charge.
Issue meaning
What this issue means
Charging Error 120 means the battery has a fault or is not ready to accept a charge.
Start here
First checks
Remove the battery for about 15 minutes, reinstall it and retry. If the error persists, iRobot notes that the battery may need replacement.
Inspection
Area to inspect
Battery seating, recovery after a 15-minute disconnect and charging behavior.
Goods Scene guidance
What to do next
If the code immediately returns after the prescribed reset, battery condition is a more likely target than routine dock maintenance.
Practical guidance is kept separate from manufacturer wording.