Rocket Espresso
Overfill / Fill Valve Stuck Open
Water continuously flows into the boiler and out of the safety valve or expansion valve.
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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
Stuck inlet solenoid valve, Shorted control signal keeping valve energized, Faulty level probe reading low, Scale debris in valve seat
How to Fix / Troubleshooting
Safety first: Turn off and unplug the machine immediately. Overfilling can cause dangerous pressure and leaks.
- Observe behavior: If water continues to enter the boiler with the machine off, the inlet solenoid valve is mechanically stuck open and must be replaced.
- Check level probe: Clean the level probe to ensure it correctly detects water level.
- Inspect solenoid valve: Remove and clean the valve body and plunger with descaling solution. If the plunger or seat is damaged, replace the valve.
- Control signal check: If the valve only overfills when powered, the control board may be sending a constant fill signal and should be tested by a technician.
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Repair Difficulty
Hard
4/5
Required Part
Boiler Inlet Solenoid Valve
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