So i had this error before and i had to send my printer to robo to have it repaired. After receiving the printer back it worked flawlessly with minor bed adhesion issues. Needless to say i was prepared to see this code pop up again, but things rarely go as planned. Today i got the same error. Last night i took the filament out and because it was late i figured i'll put in new one in morning. As i'm about to load the filament the error pops up. I called robo and their best help was at that moment was email and skype appointment that not sure i'll be getting anytime soon. I decided to tinker myself instead. And I guess the main issue was the wires came apart in the thermistor. I soldered them together and printer is working good for now.