How do I know when an ink cartridge needs to be replaced?
The printer's ink light will stay on when the ink cartridge is expended. You may also see a message on your computer screen.
Note: If any of the cartridges installed in the product is broken, incompatible with the product model, or improperly installed, Epson Status Monitor will not display an accurate cartridge status.
You may also need to replace a cartridge that is more than six months old, if your printouts do not look their best even after cleaning and aligning the print head.