This document is for HP Smart Tank Wireless 450, 455, and 457 printers.
An E9 error occurs when the printer detects that ink system maintenance is required. An Ink System Maintenance page prints containing instructions to open and close the printhead access door to resolve the error.
note:HP recommends opening and closing the printhead access door 3-4 times to remove any ink buildup and maintain the best print quality.
E9 Alerts and Maintaining Print Quality on HP Smart Tank 350, Wireless 450, Plus 550, 650 Printers
Learn how to maintain print quality if you see E9 Alerts on HP Smart Tank 350, Wireless 450, Plus 550, 650 Printers.
Figure : Number of Copies icon alternates between 'E' and '9'
Figure : Ink System Maintenance page
