Epson EPL-N7000 Reference Manual page 354

To clear this error, select Clear Warning from the control panel's
Reset menu. See "Reset Menu" on page 410 for instructions.
Duplex Mem Overflow
There is not enough memory for duplex printing. The printer
prints only on the front side 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 + Cancel Job button to cancel 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.
Duplex Unit Open
The upper or lower cover of the optional Duplex Unit is open.
Close the covers.
Feed Jam
A paper jam has occurred at the paper feeder. Remove the
jammed paper.
Format Error ROM A
An unformatted ROM module has been inserted.
To clear this error, either press the N Start/Stop button or turn off
the printer and remove the ROM module, then reinstall the ROM
module. If that fails to clear the error, contact your dealer.
Formatting HDD
The HDD is being formatted.
Troubleshooting
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