What does the Viessmann Vitodens 050-W E279 fault code mean?
The E279 fault code indicates a problem with the system exhaust, which may affect the boiler’s ability to vent combustion gases properly. This can lead to safety concerns and requires immediate attention to ensure safe operation.
Common Causes
- Blocked Flue: A blockage in the flue system can prevent exhaust gases from being expelled, triggering the fault code.
- Faulty Exhaust Fan: If the exhaust fan is malfunctioning, it may not be able to draw out the combustion gases effectively, leading to this error.
Can I fix it myself? (DIY)
It is strongly advised to call a Gas Safe Engineer to diagnose and repair this issue, as it involves gas and electrical components that can be dangerous if handled improperly.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing the E279 fault could range from £150 to £300, depending on whether the issue is a simple blockage or requires replacement of the exhaust fan.