Epson EPL-N3000 Reference Manual page 317

Reset
The printer's current interface has been reset and the buffer has
been cleared. However, other interfaces are still active and retain
their settings and data.
Reset All
All printer settings have been reset to the default configuration,
or to the last settings that were saved.
Reset to Save
A control panel menu setting was changed while the printer was
printing. Press the N Start/Stop button to clear this message. The
setting will become effective after printing has finished.
Alternatively you can clear this message by performing Reset or
Reset All on the control panel. However, the print data will be
deleted.
ROM Check
The printer is checking the ROM.
Self Test
The printer is currently performing a self test and initialization.
Service Req xyyyy
A controller error or a print engine error has been detected. Turn
off the printer. Wait at least 5 seconds and then turn it back on. If
the error message still appears, write down the error number
listed on the LCD panel (xyyyy) and turn off the printer, unplug
the power cord, and contact a qualified service representative.
Stacker Error 002
The Stacker was removed while the power is on. Switch the power
off, reinstall the Stacker, then switch the power on again.
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Troubleshooting