I have a new iMac running 10.11.3 and when I try to wirelessly connect it to our Epson Artisan 837 printer, the iMac doesn't see it. The same printer is used by another iMac and a MacBook Pro with no issues. I followed the instructions Epson provides: Go in to Preferences > Printers > click +. When I click the "+" nothing is in the list.
How do I connect to the printer?
iMac, OS X El Capitan (10.11.3)
Are you certain that the printer and your new Mac are on the same Local Area Network as the printer.
Print the information page from the printer and look for the IP address listed in the printed network information.
Then, on your iMac look in System Preferences > Network and your IP address will be listed there.
Post those two IP addresses and we can likely determine if they are on the same network for you.
Try resetting the printing system and then add the printer Reset the printing system on your Mac - Apple Support
Sorry, I should have mentioned that I did reset it according to the document you provided the link for. Still not working.
Try the tips here Get help resolving printer issues on your Mac - Apple Support
iMac can't find wireless epson printer
