Troubleshooting Your Roomba - How to Correct Error Codes
iRobot Roomba 500 Series Error 9 Troubleshooting - YouTube
Roomba Error Codes (Light Codes): The Complete Guide
Roomba j7+ I have just gotten error 30 this morning and worked fine then at 9PM it's happened 3 times and I've emptied the bin, cleaned the sensors. 90Seconds later it appeared.