What should I do if I see error code E-2, E-3, or E-7 on the network connection report?

These errors indicate that no wireless network name (SSID) was found or the entered password does not match the router. Try turning off the router or access point, waiting about 10 seconds, and turning it back on, and move the product closer to the router while removing any obstacles. Also confirm that the SSID uses only ASCII characters and symbols, and verify that you are using the correct network password as shown on your router's label. (Page 46)

From the official Epson EcoTank ET-3850U All-in-One Wireless Printer manual, page 46

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