IBM 1220 - Manual (Page 87)

85
Invalid Engine Code
What this message means:
The printer engine code has not been programmed or is not valid.
What you can do:
Call for service.
See also:
Calling for service
What this message means:
The code in an internal print server is not valid. The printer cannot receive and process jobs
until valid code is programmed into the internal print server.
What you can do:
Download valid code to the printer internal print server.
Note: You can download network code while this message is displayed.
ITU/Fuser Maint
What this message means:
The counters that track wear on the image transfer unit and fuser have reached their limit.
What you can do:
Replace the image transfer unit and fuser.
See also:
Replacing the fuser ; Replace the image transfer unit and transfer roller
Invalid
Network Code Invalid Standard
Network Code