Unless people actually have an epson printer, I wish they wouldn't chime in with basic re-install, un-install, and update driver phrases.
-removing the epson printer from list and adding it -FAIL
-restarting PC or epson printer -FAIL
-updating epson wireless connection -FAIL
-updating epson drivers -FAIL
Heres the real issue Epson printer/scanner folks running Yosemite 10.10 - when the OS upgraded, it forgot about printer/scanner duos. You need to reassign the scanner IP address. As of now your mac can't see the epson as a scanner, only a printer, and the epson scanner can't see the Mac. The solution below is only a bypass, not a direct fix, as apple will need to fix the way it views epson and maybe other brand printer/scanners.
SOLUTION
You need the Epson Scan Utility - if you already have it then just update your settings: read below
Go to your Launchpad or applications and search for "Epson Scan Settings" App and open this.
(if you don't have this app go to epson, lookup your printer/scanner and download the scan utility app) (Download gives you 2 apps: scan utility and settings )
Open the settings app: Once inside this app is will ask you to choose your scanner, then select connection as Network, then add the scanner it finds, then hit ok.
Thats it!
Now just use your epson scan utility to scan. Unfortunately Yosemite still won't recognize scanner in printers and scanners page and in image capture, but hey at least you can scan now. Im hoping after a restart and a few scanner uses it might finally get identified as a scanner by the OS but its doubtful.
Hey apple how about fixing Yosemite to recognize epson printer/scanners! This is why i hate upgrading all OS's!