HP Deskjet 3420 Printer Offline
Printer offline error is due to improper/irregular communication between the printer and the network source.
- Get the HP Print and Scan doctor utility tool to fix the offline error.
- Reset the printer and the router to resolve the problem.
- Make the printer as the default one for printing/scanning jobs.
- Connect the printer a proper wireless or wired network.
- Make sure to update the printer driver to the latest version.
- Get the latest version of the firmware installed for the printer.