!
error HP
Error Code Incompatible ink cartridges
Warning about using non-compatible or incorrect ink cartridges for printer model.
? What Causes This
Incorrect ink cartridges have been installed that are incompatible with the printer model.
✓ How to Fix It
Ensure all ink cartridges used are compatible with your specific printer model and replace if necessary.
Source: page 239 of the official manual
From the manual
This error code appears in:
HP Officejet Pro 8600 E All-in-One Printer N911a