• Water tank is empty, not properly seated, or incorrectly installed
• Inlet water line is kinked, pinched, or disconnected
• Water tank cap or sealing gasket is missing or damaged
• Mineral deposits and scale buildup inside water lines (common in hard water areas across USA)
• Clogged water inlet filter or mesh screen
• Brew unit is blocked by coffee grounds or debris
• Pressure sensor malfunction or electrical connection issue
• 120V power supply fluctuation affecting pump operation
• Internal pump failure preventing water circulation
• Faulty valve in the water distribution system