What should I do if I see a 'Cartridge is low' or 'Cartridge is very low' message?
If you see a 'Cartridge is low' or 'Cartridge is very low' message on the printer control panel or EWS, you should refer to the toner cartridge replacement section in Chapter 3 of the manual for instructions on how to order and install replacement cartridges.
From the official HP Color Laserjet Managed E45028 manual, page 129
Have a follow-up question?
Answers from the official manual.
Common questions