F18
Miele
Overpressure / Pump Run Time Fault
Machine displays F18; internal pressure or pump overrun fault
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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
Blocked coffee outlet, clogged brew unit filter screen, scaled internal piping, faulty overpressure valve
How to Fix / Troubleshooting
Safety first: Unplug the machine and allow it to depressurize before opening.
User-level actions:
- Clean the coffee spouts and outlet thoroughly with a brush and hot water.
- Remove and clean the brew unit, paying attention to the metal filter screen.
- Run a full descaling cycle to clear internal restrictions.
Technical inspection:
- Inspect the overpressure valve near the pump for blockage or sticking.
- Check silicone hoses for internal collapse or severe scaling.
Resolution:
- Replace a faulty overpressure valve or heavily scaled hoses.
- If F18 persists despite a clear hydraulic circuit, the pump or control logic may be faulty and require professional diagnosis.
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Repair Difficulty
Hard
4/5
Required Part
Overpressure Valve / Coffee Outlet Path
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