@martinrozer
You can read the manual or visit their official website to fix issues related to the HP printer offline. In a wireless HP printer, the issue of the HP Printer being offline is common, after a power outage, as it interrupts the connection. In such a situation, users can begin by restarting the wireless router and this should also reset the router. After successfully resetting the wireless router, the network will reboot and the wireless printer should be back online. In many cases, this troubleshooting fix works and should be attempted before going for any other method. (Fix, Error, Solution Center, Laptop Support, issue, IP address, Codes, support assistant , )