9
Senseo Internal Communication / Sensor Bus Error

Error 9 or nine flashing LEDs; machine powers on but immediately signals fault, no heating or pumping.

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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 wiring harness between sensors and control PCB, corroded connectors, damaged PCB tracks, moisture ingress on electronics

How to Fix / Troubleshooting

Safety first: Unplug the machine and keep it unplugged during all checks.

  • Dry the unit: If the machine was recently exposed to steam or a spill, let it dry in a warm, dry place for 24 hours (unplugged).
  • Visual inspection (advanced): Remove the outer cover and inspect the wiring harnesses and connectors for corrosion, loose plugs, or broken wires. Reseat connectors firmly.
  • Check for leaks: Look for signs of water leakage around the boiler, pump, and hoses that may have dripped onto the PCB.
  • Do not clean PCB with water: If contamination is visible, use isopropyl alcohol and a soft brush, then allow to dry completely.
  • If error persists: The control PCB may be damaged and require replacement by a professional.
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Repair Difficulty

Professional Required 5/5

Required Part

Main Wiring Harness, Control PCB
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