The robot isn't making proper contact with the charging station. Check the contacts.
- Slide the robot off the charging station.
- Wipe the four metal charging contacts on the bottom of the robot and the two contacts on the charging station with a dry cloth.
- Make sure the charging station is plugged in and the area around it is clear.
- Slide the robot back onto the station. The light ring will pulse while charging and turn solid when fully charged.
If that didn't work, the battery may need a reset. Remove the robot from the station and hold down the HOME button for 10 seconds until all lights go off. Then place it back on the charger for 3 hours.
Heads up: For long-term storage, you must turn the robot off using that same 10-second HOME button hold. Store it in a cool, dry place.