Thanks, ***** ***** why you are getting the error code, the error code indicates defective printhead, as the printhead is not a user-replaceable part, there is a reason for that, the chip on the printhead is very delicate and as you have removed the printhead and tried to clean it manually, the chip on it seems got damaged during that process. The error code indicate defective printhead, it is not neccessary that, you have to remove the printhead to get the error code, when ever the printhead is damaged or defective, the printer diplay the error code. This is a very unfortunate case, but as the printhead is less than a year old , that means it is still in warranty period and you can get a free replacement of the printer from Epson. But, do not tell them that, you have removed the printhead from the printer because that will void the warranty. Just tell them that, you tried to clean the printhead and suddenly the error code appeared on the screen.
One more thing, as you have removed the printhead already, then it can be not installed properly, you can try to remove once more and reseat it. If the problem persists then, call Epson and get the printer replaced. Please let me know, if you need any further information otherwise please remember to give a positive rating, as that is the only way I am compensated for my time and effort.