What should I do when the 'Cartridge is low' or 'Cartridge is very low' message appears?
The 'Cartridge is low' or 'Cartridge is very low' message displays on the printer control panel or the HP Embedded Web Server (EWS). The manual addresses this as a known condition with guidance provided in the Solve Problems chapter. Users should monitor cartridge levels and plan for replacement accordingly. (Page 129)
From the official HP Color Laserjet Managed E45028 manual, page 129
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