F9
Melitta
Control Board / Firmware Error
Display shows F9 and the machine reports a general electronics 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
Corrupted firmware, Power surge damage to control board, Internal communication error between boards, Moisture on electronics
How to Fix / Troubleshooting
Safety first: Unplug the machine before inspecting internal components.
Steps:
- Hard reset: Disconnect from mains for at least 15 minutes. Press the power button once while unplugged to discharge capacitors, then reconnect and test.
- Check environment: Ensure the machine is not exposed to steam from kettles or cooktops, which can condense on the electronics.
- Inspect for moisture: If comfortable opening the housing, check the control board area for condensation or leaks. Dry gently with air and allow 24 hours before re-powering.
If F9 persists, the main control board is likely defective. Replacement or firmware reprogramming should be performed by an authorized Melitta service center.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control Board
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