What does the Viessmann Vitodens 050-W E351 fault code mean?
The E351 fault code on the Viessmann Vitodens 050-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 operation.
Common Causes
- Dirty Flame Sensor: A buildup of soot or debris on the flame sensor can prevent it from accurately detecting the flame.
- Faulty Flame Sensor: The flame sensor may be malfunctioning or damaged, requiring replacement to restore proper function.
Can I fix it myself? (DIY)
While cleaning the flame sensor can be a DIY task if you have experience, it is highly recommended to call a Gas Safe Engineer for any gas or electrical issues to ensure safety and compliance with regulations.
Estimated Repair Cost (2026 UK Prices)
The estimated cost for replacing a flame sensor on a Viessmann Vitodens 050-W is approximately £150, which includes the part and labour. This cost reflects the typical price for a qualified engineer’s service and the component itself.