What do I do if I get 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 security key/password does not match the router. Try turning off your router, waiting about 10 seconds, and turning it back on, and make sure the SSID uses only ASCII characters and symbols. Also verify that you are using the correct password from your router label, and move the product closer to the router to improve signal strength. (Page 39)

From the official Epson EcoTank ET-2980U All-in-One Printer manual, page 39

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