Breville espresso machine displays ER09 and immediately stops brewing; sometimes accompanied by water leaking into the drip tray.

Safety: Unplug the machine and allow pressure to dissipate before opening any panels.

User-level cleaning:

• Backflush: Use a blind filter and Breville cleaning tablet to backflush the group head. This cleans the 3-way solenoid valve and exhaust path.
• Repeat cycles: Perform multiple backflush cycles until the discharge water runs clear.

Advanced service:

• Open the case to access the 3-way solenoid valve (usually near the group head).
• Check the coil connector for secure fit and signs of overheating.
• Test the coil resistance with a multimeter; an open circuit indicates a failed coil.
• Disassemble the valve body (if serviceable) and clean internal parts with descaler to remove scale and coffee oils.

Resolution: Replace the 3-way solenoid valve assembly if the coil is open or the valve remains stuck after cleaning. Persistent ER09 may indicate a control board driver fault, requiring professional diagnosis.