How come my 'HP printer not printing black'?
The ink level in the cartridge must be low. Hence you may get the 'HP printer not printing black' error message. To be more specific, a problem with the cartridge is likely to be to blame for the problem. The printer may not be able to print in black if the cartridge's ink level is low. The printer's black cartridge has to be changed if you want to keep printing in black.
https://www.hpprintersupportpro.us/blog/hp-printer-is-not-printing/
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Antonios commented
To resolve this issue, use only genuine HP cartridges. Additionally, you can remove the black cartridge to print only with the tri-color cartridge, replace any empty or defective cartridges, or clean the printhead.
Regards,
Peter