Irobot roomba 530 cliff sensor issue light blinks red and error # 6 beep sound - YouTube
iRobot Roomba 890 Troubleshooting - iFixit
Roomba has not been running and has an empty charge despite being connected to home base. Green light is flashing at irregular intervals. Please help! : r/roomba
SOLVED: Why is the battery light flashing on my roomba? - iRobot Roomba 655 Pet Series - iFixit