A couple of weeks ago I got an error message and the printer would not print. While the message was different from yours, it referred to a sensor that might have been out of place. When I called Epson they had me do several power cleanings and the printer recovered.
So, what I discovered is that sometimes an error message about something that seems critical and major might be because of something simpler. If you can get the printer to do another cleaning, give it a try and see what happens.