What does the Viessmann Vitodens 100-W F41 fault code mean?
The F41 fault code on the Viessmann Vitodens 100-W indicates a problem with the condensate trap, which may be blocked or malfunctioning. This can prevent proper drainage of condensate, leading to potential boiler shutdown and operational issues.
Common Causes
- Blocked condensate trap: Debris or sludge accumulation can obstruct the flow of condensate, causing the fault code to trigger.
- Faulty condensate pump: If the pump responsible for moving condensate away from the boiler is defective, it can lead to the F41 error.
Can I fix it myself? (DIY)
It is advisable to call a Gas Safe Engineer to address this issue, as working on gas appliances can be dangerous. Attempting to fix gas or electrical components without proper training can lead to serious safety risks.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing the F41 fault, including cleaning or replacing the condensate trap, is around £150 to £250. This cost reflects the need for professional service and potential replacement parts.