At Epson printers flashing lights has different meanings and based on the number of lights and the pattern used in flashing the error could appear from different reasons. The best way to figure this out is to check the entire manual for errors indicated by the lights and if you can't figure it out in a timely manner then you should go to a specialized service technician. I will provide a link from where you can search through the manual in order to find the errors you have.
