HP 79 Service Error
What it means
A firmware-level error, most often triggered by a corrupt print job or an out-of-date firmware version rather than failed hardware. Turning the printer off, clearing the print queue, and updating the firmware resolves a large share of cases.
Guides that cover this kind of fault
A guide written for 79 itself is still being checked against the manufacturer's documentation. These cover the same underlying problem and are filed under printer not printing.
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Common questions
What does the 79 error mean on a HP printer?
A firmware-level error, most often triggered by a corrupt print job or an out-of-date firmware version rather than failed hardware. Turning the printer off, clearing the print queue, and updating the firmware resolves a large share of cases.
Is the 79 error serious?
It is worth attention but not alarm. Switching the printer off, unplugging it for a minute and checking for anything physically in the way resolves a large share of cases before anything else is needed.
Different code or problem?
Switch off and unplug a printer before reaching inside it. If a fault involves the power supply or internal electronics, or the machine is under warranty, contact the manufacturer or a qualified technician. Full disclaimer. Brand and code names are trademarks of their owners; PrinterFixUp is independent and unaffiliated.