This error would occur if the printhead on the FAX overheated when printing large quantities of pages or pages with excessive dark backgrounds.
To clear the message, unplug the power cord for approimately 30 minutes to allow the FAX to cool down. After approximatley 30 minutes, plug the power cord in and print the help list to test.

To print the help list:

1. Make sure that there is no document in the ADF.
2. Press the Copy/Reports, then press 2.