My Epson L3250 prints gray instead of black. What could be the issue?

Printing gray instead of black suggests a mix of black and color inks is being used. This can happen if the printer is trying to compensate for a perceived lack of black ink, even when it's full. Check the printer's settings to ensure it's not set to 'Photo' mode, which often blends colors. Also, try printing a nozzle check pattern and cleaning the printhead as described above.