Symptoms
• Machine stops mid-brew cycle and displays E15 on the control panel
• No water flows when attempting to brew coffee or dispense hot water
• Weak or no water pressure during beverage preparation
• Machine beeps repeatedly and halts operation
• Water tank appears full but machine won't draw water
• Error message remains even after attempting to brew again
Possible Causes
• Water tank is empty, not properly seated, or not filled sufficiently
• Water supply line kinked, pinched, or disconnected internally
• Water inlet filter or intake valve clogged with mineral deposits from hard water common in USA regions
• Brew unit water inlet port blocked or partially obstructed
• Descaling cycle overdue due to mineral buildup from tap water hardness
• Water pump failure or malfunction
• Faulty water level sensor unable to detect water presence
• 120V power supply to water pump interrupted or unstable
• Internal water system pressure valve stuck or defective
Safety Checks You Can Do
• Check your home circuit breaker panel to ensure the outlet powering the coffee machine has not tripped; reset if necessary
• Remove and inspect the water tank for proper seating and fill it with fresh filtered or bottled water to the maximum line
• Verify the water tank connection point is clean and the tank slides in until it clicks or seats fully
• Inspect the water inlet tube at the back or bottom of the machine for visible kinks, pinches, or disconnection
• Run a full descaling cycle using Bosch-approved descaling solution to clear mineral buildup from internal water lines and valves
• Check the drip tray and grounds container are empty and properly installed to ensure no overflow is blocking water sensors
• Remove and visually inspect the brew unit (if your model allows user removal) for debris, mineral deposits, or blockages in water inlet holes
• Empty and refill the bean hopper, then manually rotate the bean grinder dial to ensure beans are not jammed
• Power down the machine completely by unplugging it from the wall outlet for 60 seconds, then plug it back in to perform a hard reset
• After reset, attempt a test brew with fresh water in the tank and observe if water flows normally
Safety First
Always disconnect the appliance from power before performing any checks. If you are unsure about any step, please contact a qualified technician.