Rancilio
Excessive 3-Way Valve Discharge / Overfill
Drip tray fills very quickly with clear water during normal operation.
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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
Brew pressure too high causing frequent venting, Leaking boiler safety valve routed to tray, Internal leak from autofill circuit, Misadjusted expansion valve
How to Fix / Troubleshooting
Safety: Unplug and allow the machine to cool before inspecting internal plumbing.
- Observe sources: Remove the drip tray and watch where water enters during idle and brew. Identify whether it comes from the group drain, safety valve tube, or another hose.
- Check expansion valve: If water flows from the expansion valve line during brewing, brew pressure may be too high. Adjust the expansion valve to factory pressure (typically ~9 bar) using a portafilter gauge.
- Inspect safety valve: If water drips from the safety valve tube at normal pressure, replace the safety valve.
- Autofill leaks: Check the autofill solenoid and boiler inlet fittings for leaks that may be routed to the tray.
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Repair Difficulty
Medium
3/5
Required Part
Expansion Valve
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