Epson AcuLaser C8600 Reference Manual page 321

Cover E Open
Cover E, the cover on the right side of the optional Large Capacity
Paper Unit, is open. Close the cover and the error is automatically
cleared.
Cover F Open
Cover F, the optional Duplex Unit's inverter cover on the left side
of the printer, is open. Close the cover and the error is
automatically cleared.
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 is selected as the Auto Cont setting on the control panel's
Setup Menu, press the Start/Stop button to print on the back of
the next sheet, or press the
job.
If is selected as the Auto Cont setting on the control panel's
Setup Menu, printing continues automatically after a certain
period of time.
Format Error ROM A/Format Error Rom B
An unformatted ROM module has been inserted. If the ROM
module has been formatted, but is still unreadable, format it
again. If the ROM is still unreadable after reformatting, take the
module to your dealer for repair or replacement.
To clear this error, either press the Start/Stop button or turn off
the printer and remove the ROM module.
Job Cancel button to cancel the print
Troubleshooting
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