Epson EPL-N3000 Reference Manual page 314

To clear this error message, select Clear Warning from the control
panel's Reset menu. See "How to access the control panel menus"
on page 339 for instructions.
To prevent this problem from happening again, add more
memory to your printer as described in "Memory Module" on
page 204 or reduce the resolution of the image to be printed.
NonGenuine Toner
The installed imaging cartridge is not a genuine EPSON product.
Installing a genuine toner cartridge is recommended. Using a
non-genuine toner cartridge may affect print quality. EPSON
shall not be liable for any damages or problems arising from the
use of consumable products not manufactured or approved by
EPSON.
Install a genuine EPSON product, or perform Clear Warning or
Clear All Warnings of the Reset menu on the control panel to clear
the warning message. See "Replacing the imaging cartridge" on
page 224 for instructions on replacing the imaging cartridge.
Press the N Start/Stop button on the control panel to resume
printing.
Offline
The printer is not ready to print. Press the N Start/Stop button.
The level of remaining toner is also indicated on the right side of
this message.
WWWW Open
The specified cover (WWWW) does not close securely. Open the
cover once, and then close.
Optional RAM Error
The optional memory module may be corrupted or incorrect.
Replace it with a new one.
Troubleshooting
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