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Why does my Roomba® not turn on or charge? (e, i, or j series)
iRobot Roomba Problems and Troubleshooting Guide
Roomba Error Codes: All Roomba Errors A to Z solution - HomePlix
Circle of death? He'll occasionally say “error 18” but he literally just goes around in circles. I've tried cleaning the whole roomba, bumper and nothing seems to help. Any suggestions? : r/roomba
The Ultimate Guide to solve your Roomba Error Codes - SafeMode Wiki
Roomba Error Code 8: How To Troubleshoot in Seconds - Robot Powered Home