What does the Viessmann Vitodens 100-W F37 fault code mean?
The F37 fault code on the Viessmann Vitodens 100-W indicates a problem with the flame sensor, which is responsible for detecting whether the burner is ignited. If the sensor fails to detect a flame, the boiler will shut down to prevent unsafe conditions.
Common Causes
- Dirty Flame Sensor: A buildup of soot or debris can prevent the sensor from accurately detecting the flame.
- Faulty Flame Sensor: The sensor itself may be malfunctioning or damaged, requiring replacement.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for any repairs related to the flame sensor, as working with gas appliances can be dangerous. Attempting to fix it yourself may void warranties and pose safety risks.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for replacing a faulty flame sensor on a Viessmann Vitodens 100-W is approximately £150-£200. This includes the cost of the part and labour, reflecting the typical pricing for professional service in the UK.