F15
V-ZUG Steam Generator Temperature or Sensor Fault

A steam-assisted V-ZUG oven (Combi-Steam) shows F15, and steam functions do not start.

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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

Faulty steam boiler NTC sensor, Limescale buildup on the steam generator, Overheated steam heater, Wiring fault between the boiler and control board

How to Fix / Troubleshooting

Safety first: Disconnect the mains power and allow the appliance to cool completely before working on the steam system.

Step-by-step checks:

  • Descale the steam system: Run the full descaling program using the recommended V-ZUG descaling agent. Follow the on-screen instructions carefully.
  • Check water supply: Ensure the water tank is correctly seated and filled with fresh water, or that the plumbed water connection is open and filtered.
  • Inspect boiler sensor: Access the steam generator (usually located on the side or top). Check the NTC sensor connection and its wiring for damage.
  • Measure sensor resistance: With the sensor disconnected, measure its resistance at room temperature and compare it with service values. Replace the sensor if it shows an open circuit, is shorted, or is out of range.

When to call a technician: If F15 persists after descaling and sensor checks, the steam generator or its heater may be defective and should be replaced by a qualified technician.

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Repair Difficulty

Hard 4/5

Required Part

Steam Generator NTC Sensor
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