What does the Viessmann Vitodens 050-W E365 fault code mean?
The E365 fault code on the Viessmann Vitodens 050-W indicates a problem with the flue system, which is critical for the safe expulsion of combustion gases. This fault can lead to unsafe operating conditions and requires immediate attention.
Common Causes
- Blocked Flue: Debris or obstructions in the flue can prevent proper ventilation, leading to this fault code.
- Flue Gas Sensor Issue: A malfunctioning flue gas sensor may incorrectly detect a problem, triggering the E365 fault code.
Can I fix it myself? (DIY)
It is strongly advised to call a Gas Safe Engineer to diagnose and repair this issue, as working with flue systems involves gas and safety regulations that must be adhered to.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing the E365 fault could range from £150 to £300, depending on whether the issue is a simple blockage or requires replacement of the flue gas sensor.