Red Light + Single beep = Possible airfilter, roasting chamber misplacement, or incorrect RFID used.
First please press and hold the power button (the small circle in the front of the machine, right under scan).
1. If the colour turns yellow, you should follow the instructions on how to replace the air filter.
2. If it gets white, might have been that you used the wrong RFID tag. So just try your coffee changers badge and it should solve it!
Hope these tips helped you get your machine back to work but if not, and you are connected to the coffee concierge try to use the debug option to a self diagnosis.