What does the Viessmann Vitodens 111-W F52 fault code mean?
The F52 fault code indicates that there is a problem with the system pressure in the Viessmann Vitodens 111-W boiler. This typically means that the pressure is either too low or too high, which can affect the boiler’s performance and safety.
Common Causes
- Low Water Pressure: This can occur due to leaks in the system or insufficient water supply, leading to inadequate pressure for the boiler to operate correctly.
- High Water Pressure: This may be caused by a faulty pressure relief valve or expansion vessel, which can prevent the system from maintaining the correct pressure levels.
Can I fix it myself? (DIY)
If the pressure is low, you can attempt to repressurise the system by using the filling loop to add water until the pressure gauge reads between 1 and 1.5 bar. However, if you suspect high pressure or if you’re unsure, it’s crucial to call a Gas Safe Engineer to avoid any safety risks.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing a faulty pressure issue can range from £150 to £300, depending on whether it involves simply repressurising the system or replacing components like the pressure relief valve or expansion vessel.