Hi Ian. Welcome to justanswer.
Try this to reset the error.
Turn on the printer. Then press OK>Menu>Start>and then press the Up arrow 4 times. Then MAINTENANCE will be displayed on the screen. Then type 80 from the numerical keypad. Use the Down arrow so that PURGE is displayed on the screen. Then press 2783 on the numerical keypad. Then PURGE on the screen will be 0000. Then press STOP. Then on the numerical keypad press 99 to exit Maintenance mode. Then your printer will be reset and you can resume your normal printing.
Reply if this doesn't work.
Hi Ian, just checking in. How did things turn out?