My new Epson WF-3620 is only printing grayscale?
Epson WF-3620 all-in-one printer won't print in black or colors. What should I do?
Answer to the question
Remove all the ink supplies from your printer. Remove the printhead and soak it for about 5 minutes in warm water. Gently blot the printhead on paper towel to remove the excess water, then replace in the printer and then reinstall the ink supplies. If this would not work then take help from Epson WF 3620 Manual