Rocket Espresso
Pre-Infusion Valve / Group Valve Leak
Water leaks from the portafilter spouts before the pump is activated, or during pre-infusion only.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Worn pre-infusion chamber seals, Debris on valve seats, Misadjusted E61 cam, Excessive line pressure in plumbed-in mode
How to Fix / Troubleshooting
Safety first: Turn off and unplug the machine. Allow the group to cool before service.
- Check line pressure: For plumbed-in machines, ensure mains pressure is within Rocket's specified range (typically around 2–3 bar). Install a pressure regulator if needed.
- Backflush with detergent: Clean internal valves and passages to remove debris that may prevent proper sealing.
- Service pre-infusion chamber: Disassemble the E61 group to access the pre-infusion chamber and replace worn seals and springs.
- Adjust cam: Verify that the cam engages and disengages the valves fully. Adjust or replace worn cam components as necessary.
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Repair Difficulty
Hard
4/5
Required Part
E61 Pre-Infusion Valve Seals
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