You have the same problem as me just stopped hashing 5 days ago and gives this error. Teal said I need to get a multimeter to track it down.
Having a multimeter would make it quicker, but it's not necessary. It is going to be difficult to do much without having access to a linux machine to adjust voltages or update firmware though. You might need to send it back in in this case. Send me a PM and I can arrange an RMA.