Error code

HP 79

HP79
Printer Error Code· An error or status code shown on a printer's display or its software.

What it means

A firmware error occurred in the printer.

How to fix it

  1. Turn the printer off and back on.
  2. Remove the most recent print job from the queue.
  3. Update the firmware to the latest version.

Not affiliated with HP. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.