Follow the Preceding Guidelines to fix the HP Officejet Pro 9015 printer offline issue:
Visit 123.hp.com/setup to get the troubleshooting steps for HP Officejet Pro 9015 printer offline issue.
At first, verify the network connection of the HP Officejet Pro 9015 printer.
Power off the printer by unplugging the cables from power for 25 to 30 seconds and connect it back.
After that, make use of the printer offline setting, and check whether this option is enabled and this can be the major reason for this error.
Moreover, long press the Windows + I keys to access the Settings and select Devices.
Similarly, under devices select Printers & Scanners option and then pick the printer device.
On the other hand, click the HP printer device and select Open Queue.
Next, in the next window, click Printer and untick the Use Printer Offline.
And now check for the HP printer offline error, whether it persists or not.
Secondly, make sure to set your HP printer as the default printer and get the steps from 123.hp.com/setup.
For this at first, access the Printers and Scanners settings.
Under that, click the HP printer device and select Open queue.
After that, click Printer and select Set as a Default printer.
After setting your HP printer as the default one check whether the error occurrence.
Thirdly, make sure to clear of all the printing jobs on the queue on your HP printer.
Further, uninstall the HP Officejet Pro printer driver and then reinstall it from 123.hp.com/setup.
Click the link in there and get in to the downloads sections.
Choose your operating system and its correct version from the list.
Read the driver file information and click the Download button.
Finally, pick a desired location for your driver file and install it by double clicking it.
Call our professional expert team number +1-800-237-0201 squad for further details on 123.hp.com/setup.