Water backs up into the drip tray from the three-way valve after brewing, or does not release pressure from the group.

Safety first: Unplug the machine and allow it to cool before servicing the valve.

• Backflush with detergent: Use a blind basket and espresso machine detergent to clean the three-way valve internally.
• Listen for click: During a brew cycle, listen for a distinct click from the solenoid when starting and stopping. No click suggests a failed coil or no power.
• Disassemble valve (intermediate): Remove the solenoid coil and valve body. Clean the plunger and internal passages with descaling solution, then rinse thoroughly.
• Replace coil if needed: If the coil is open-circuit or overheated, replace it with a compatible Rocket solenoid coil.