What does the "Ink System Failure" error code on an HP DeskJet 4155e typically indicate?

The "Ink System Failure" error code on an HP DeskJet 4155e usually means there's a problem with the printer's ink delivery system. This could be due to a faulty ink cartridge, clogged printhead, or a problem with the internal ink lines. Often, reseating the ink cartridges or performing a printhead cleaning can resolve this.