E09
Siemens Control PCB Communication Fault

Communication error between control panel and main board, display flickers or shows dashes

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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 user interface and main PCB, Oxidized connector pins, Faulty user interface board, Failed main control board

How to Fix / Troubleshooting

Safety: Unplug the unit before accessing any electronic components.

  • Check external factors: Ensure the power supply is stable and not provided via a long, undersized extension cord that could cause voltage drops.
  • Inspect harness connections: Remove the control panel cover and locate the ribbon cable or harness connecting the user interface to the main PCB. Reseat both ends, ensuring they are fully inserted and latched.
  • Look for corrosion: Examine connector pins for oxidation or moisture. Clean lightly with contact cleaner and a soft brush if needed.
  • Visual inspection of boards: Check both the user interface PCB and main PCB for burnt components, cracked solder joints, or physical damage.

If reseating and cleaning connectors do not resolve the error, one of the boards may need replacement. This is typically done by replacing the entire control module rather than individual components.

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Repair Difficulty

Hard 4/5

Required Part

Main Control PCB
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