!!
critical HP
Error Code LED blinks rapidly when totally empty toner cartridge
Alerts that the toner has completely ran out of supply.
? What Causes This
Toner is depleted, machine needs replacement.
✓ How to Fix It
Replace with a full Samsung brand toner cartridge (see page 8.5).
Source: page 15 of the official manual
From the manual
This error code appears in:
HP Samsung Xpress SL M2885 Laser Multifunction Printer Series