E9
Klarstein Control Panel / Keypad Communication Error

Display shows E9 and the Klarstein coffee maker’s display or buttons become unresponsive.

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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 ribbon cable between control panel and main PCB, Moisture ingress behind control panel, Failed touch keypad, Control board communication IC fault

How to Fix / Troubleshooting

Safety first: Unplug the machine before removing the control panel.

Dry and reset:

  • If the panel got wet (cleaning spray, steam), leave the machine unplugged for 24 hours in a dry room to allow moisture to evaporate.
  • After drying, reconnect power and test.

Inspect connections (advanced):

  • Remove the top or front cover to access the display/keypad board.
  • Carefully unplug and replug the flat ribbon cable between the keypad and main PCB.
  • Check for corrosion or burnt spots on the boards.

If the keypad membrane or touch panel is defective, replace the entire control panel assembly. If the main PCB is damaged, it will also need replacement.

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Repair Difficulty

Hard 4/5

Required Part

Control Panel / Keypad PCB
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