F09
Viking Keypad / User Interface Communication Fault

Viking oven displays F09; oven may not start and keypad may be unresponsive or behave erratically.

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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 touchpad and EOC, Damaged touchpad membrane, Failed user interface board, Failed EOC communication circuit

How to Fix / Troubleshooting

Safety: Disconnect power before removing the control panel or touching any wiring.

Steps:

  • Remove the control panel bezel according to the service manual (usually screws under trim or behind knobs).
  • Locate the flat ribbon cable connecting the keypad/touchpad to the EOC. Carefully unplug and re-seat the connector to clean contacts.
  • Inspect the ribbon for cracks, kinks, or burn marks. Replace the keypad or user interface assembly if damaged.
  • If re-seating does not resolve the error, replace the keypad assembly. If a new keypad does not fix the issue, replace the EOC.

Note: Handle ribbon cables gently and avoid bending sharply; damage can cause intermittent faults.

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Repair Difficulty

Medium 3/5

Required Part

Oven Touchpad / User Interface Assembly
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