Epson EPL-N3000 Reference Manual page 309

Collate Disabled
Printing by specifying the number of copies is no longer possible
due to a lack of memory (RAM) or free disk space on the optional
Hard Disk Drive. If this error occurs, print only one copy at a time.
To clear this error, select Clear Warning from the control panel's
Reset menu. For instruction about accessing the control panel
menus, see "How to access the control panel menus" on page 339.
Cooling Down
The printer lowers its temperature to optimize for the fixing toner.
Wait for a moment for Ready to appear in the LCD panel.
DM Error 001
The Duplex Unit has become separated from the printer. Turn the
printer off, reinstall the Duplex Unit and turn the printer on again.
Duplex Mem Overflow
There is not enough memory for duplex printing. The printer
prints only on the front and ejects the paper. To clear this error,
follow the instructions below.
If Off is selected as the Auto Cont setting on the control panel's
Setup menu, press the N Start/Stop button to print on the back
of the next sheet, or press the
print job.
If On is selected as the Auto Cont setting on the control panel's
Setup menu, printing continues automatically after a certain
period of time.
Face-down Full
The output paper at the face-down tray is full. Remove the paper
that has been output and press the N Start/Stop button. Printing
resumes.
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Troubleshooting
Cancel Job button to cancel the