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If you are printing something and see an alert message, ‘unable to print E9'. It is caused because paper or something else is stuck in the printer. It can also arise due to an update error. Let’s see what does e4 mean on hp printer. Open the cover of the scanner. Check if there are any paper scraps jammed in the printer. Clean the printer thoroughly. See, if there is any dirt stuck in the printer. Clean the print head and nozzle. Go to the settings and select improve quality option.