What does the Viessmann Vitodens 050-W E278 fault code mean?
The E278 fault code indicates a problem with the system air intake, which may prevent the boiler from operating efficiently. This issue can lead to insufficient combustion air, affecting the boiler’s performance and safety.
Common Causes
- Blocked Air Intake: Debris or obstructions in the air intake can restrict airflow, triggering the fault code.
- Faulty Air Pressure Switch: A malfunctioning air pressure switch may fail to detect proper airflow, resulting in the E278 error.
Can I fix it myself? (DIY)
It is advisable to call a Gas Safe Engineer to diagnose and repair this issue, as it involves gas and electrical components that require professional expertise.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing the E278 fault could range from £150 to £300, depending on whether the issue is a simple blockage or requires replacement of the air pressure switch.