What does the Viessmann Vitodens 050-W E337 fault code mean?
The E337 fault code indicates a problem with the system air vent, which can lead to insufficient air supply for combustion. This can affect the boiler’s efficiency and safety, requiring immediate attention.
Common Causes
- Blocked Air Vent: Debris or obstructions may prevent proper airflow, leading to the fault.
- Faulty Air Vent Mechanism: The air vent may be malfunctioning or damaged, failing to operate correctly.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer to address this issue, as it involves gas and safety components. Attempting to fix it yourself could pose serious risks.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for fixing the air vent issue is around £150 to £250, depending on whether the air vent needs cleaning or replacement. This includes labour and parts, reflecting the complexity of the repair.