The Ultimate Guide to solve your Roomba Error Codes - SafeMode Wiki
Roomba Error Codes (Light Codes): The Complete Guide
Fix: Roomba Charging Error 5 (Charging System isn't Working Correctly)
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.
Roomba Error 15 | How To Fix in Seconds - Smarthome Hut