HP can't communicate with or detect the printhead. On models with a removable printhead you can reseat and clean it; on others a reset is the main option.
Work through these in order; most people are fixed by the first two or three.
Unlatch and remove the printhead, wipe the contacts, then reinstall and lock it down firmly.
From the printer tools or HP Smart, run printhead cleaning once or twice and allow rest time between cycles.
Unplug power for 60 seconds with the printer on, then reconnect and retry.
For stubborn clogs on removable printheads, dab the nozzles with a lint-free cloth and warm distilled water, dry, and reinstall.
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