The HP Printer 79 Service Error may be seen on your printer on certain occasions. This is a service error which can indicate that a print job has become corrupt.How to Fix & Solve HP Printer Error 79 Issue · 1. Log in and Remove the Printer from your Device. The service error 79 indicates that the print job or the printer firmware might be outdated. Hence, the spooler would fail to communicate with the HP printer.I suggest trying to unplug your router for a moment first, then restart the printer and check if the error remains or not, by that you remove any possible.