What does the Viessmann Vitodens 111-W F75 fault code mean?
The F75 fault code on the Viessmann Vitodens 111-W indicates a problem with the heating circuit setpoint, which may prevent the boiler from reaching the desired temperature. This issue can arise from incorrect settings or sensor malfunctions within the heating system.
Common Causes
- Incorrect Temperature Settings: The setpoint for the heating circuit may be incorrectly configured, leading to a mismatch between the desired and actual temperatures.
- Faulty Temperature Sensor: A malfunctioning temperature sensor can provide inaccurate readings, causing the boiler to fail in achieving the correct heating setpoint.
Can I fix it myself? (DIY)
If you are comfortable with basic boiler settings, check the temperature setpoint in the boiler’s control panel and adjust it if necessary. However, for any issues related to sensors or gas components, it is crucial to call a Gas Safe Engineer to ensure safety and compliance with regulations.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing the F75 fault could range around £150 to £250, primarily depending on whether a temperature sensor needs replacement, which typically costs between £100 and £200 including labour.