You may try the following ways for Epson printer troubleshooting when not printing: 

1) Make sure all your cable connections are secure.

2) Restarting both the printer and computer can help.  

3) Outdated printer drivers huddle your task so update drives to the latest version. 

4) confirm that the printer is set to its default printer. 

5) Clear paper jams and printing queue if pending 

6) Running the built-in printer maintenance tools can fix any kind of common error in Epson printers.