Epson EPL-N3000 Reference Manual page 308

Can't Print Duplex
The printer has encountered problems during duplex printing.
Make sure you are using an appropriate type and size of paper
for the Duplex Print Unit. The problem could also be a result of
incorrect settings for the paper source you are using. Pressing the
N Start/Stop button will print the rest of the print job on only one
side of the paper. Press the + Cancel Job button to cancel the print
job.
Cart Near Expiry
The life of the imaging cartridge is near its end. You need to
prepare a new imaging cartridge.
Check Duplex P-Size
The paper size loaded in the printer is not appropriate for the
optional Duplex Unit. Load correct paper size and press the N
Start/Stop button to resume printing.
Check Paper Size
The paper size setting is different from the size of paper loaded
in the printer. Check to see if the correct size of paper is loaded in
the specified paper source.
To clear this error, select Clear Warning from the control panel's
Reset menu. See "How to access the control panel menus" on page
339 for instructions.
Check Paper Type
The media loaded in the printer does not match the paper type
setting in the printer driver. Media that matches only the paper
size setting will be used for printing.
To clear this error, select Clear Warning from the control panel's
Reset menu. See "How to access the control panel menus" on page
339 for instructions.
Troubleshooting
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