F15
Melitta
Internal Communication Bus Error
Display shows F15 and the machine indicates a communication error between modules.
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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
Loose cable between main board and user interface, Damaged display/control PCB, Electrical noise or surge damage, Corroded connectors
How to Fix / Troubleshooting
Safety first: Unplug the machine before removing panels.
Steps:
- Check external power: Plug the machine directly into a wall outlet (no power strips) to rule out supply issues.
- Inspect internal cables: Remove the top cover and check ribbon cables and harnesses between the main control board and the front display/keyboard PCB. Reseat connectors firmly.
- Look for corrosion: If you see green/white corrosion on connectors, clean gently with contact cleaner and a soft brush (machine unplugged).
If F15 persists, either the main board or the user interface board is defective. Replacement should be done by a qualified technician.
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Repair Difficulty
Professional Required
5/5
Required Part
User Interface PCB
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