What does the Viessmann Vitodens 100-W F36 fault code mean?
The F36 fault code on the Viessmann Vitodens 100-W indicates a problem with the ignition electrode, which is responsible for igniting the gas within the boiler. This issue can prevent the boiler from starting or operating efficiently.
Common Causes
- Dirty or Damaged Electrode: The ignition electrode may be fouled with debris or damaged, preventing it from creating a spark.
- Electrical Connection Issues: Loose or corroded connections to the ignition electrode can disrupt the electrical flow needed for ignition.
Can I fix it myself? (DIY)
It is highly recommended to call a Gas Safe Engineer to address this issue, as working with gas appliances can be dangerous. Attempting to fix electrical or gas components without proper training can lead to serious safety hazards.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing the F36 fault code is around £150 to £250. This includes the cost of replacing the ignition electrode and any necessary labour charges from a qualified engineer.