Unable to Print with Brother Printer

Alternately, a possible workaround is trick the machine that the purge unit has been replaced/cleaned:

• power off the MFC-665CW and unplug;
• press and hold the Menu button while plugging back in;
• release only when all the LED indicators are flashing;
• this is the Maintenance Mode;
• press 8, 0;
• press Black (Start) a couple of times to display “purge: xxxx”;
• press 2, 7, 8, 3. This would reset the purge counter;
• display should now be “purge:0000”;
• press the Stop/Exit button.
• press 9, 9 to exit the maintenance mode.

In some versions, "purge" is worded as "flush". A worst case scenario is a faulty traverse motor / mechanism fault. This is responsible for moving the printheads along with its carriage left to right. A fault would not park the carriage properly and therefore self-clean could not be initiated.