⚠
warning HP
Error Code Black cartridge very low on ink
Alert signaling that the black ink cartridge needs replacement due to extremely low levels.
? What Causes This
Black ink level has dropped below a threshold required for normal printing operations.
✓ How to Fix It
Either replace the current black ink cartridge or switch temporarily to grayscale mode until the new cartidge is installed.
Source: page 244 of the official manual
From the manual
This error code appears in:
HP Officejet Pro 8600 E All-in-One Printer N911a