What does the Viessmann Vitodens 111-W F95 fault code mean?
The F95 fault code on the Viessmann Vitodens 111-W indicates a problem with the heating circuit reset, which typically suggests that the boiler has detected an issue preventing it from operating normally. This can lead to the heating system being unable to function, requiring attention to restore proper operation.
Common Causes
- Low Water Pressure: Insufficient water pressure in the heating system can trigger the F95 fault, as the boiler needs adequate pressure to operate effectively.
- Faulty Sensors: Malfunctioning temperature or pressure sensors can cause incorrect readings, leading the boiler to believe there is a fault in the heating circuit.
Can I fix it myself? (DIY)
If you are comfortable with basic maintenance, check the water pressure gauge on the boiler. If the pressure is below 1 bar, you can safely re-pressurise the system using the filling loop. However, for any gas or electrical issues, it is crucial to call a Gas Safe Engineer for safety reasons.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing the F95 fault could range from £150 to £250, primarily depending on whether the issue is simply low water pressure or if it involves replacing faulty sensors, which can be more expensive due to parts and labour.