What does the Worcester Bosch Greenstar CDi F52 fault code mean?
The F52 fault code indicates that there is an issue with the system pressure in the Worcester Bosch Greenstar CDi boiler. This typically means that the pressure is either too low or too high, which can affect the boiler’s operation and efficiency.
Common Causes
- Low System Pressure: This can occur due to leaks in the heating system or radiators, leading to a drop in pressure.
- High System Pressure: This may be caused by a faulty pressure relief valve or an issue with the expansion vessel, preventing proper pressure regulation.
Can I fix it myself? (DIY)
If the system pressure is low, you can attempt to re-pressurise the system using the filling loop, following the manufacturer’s instructions. However, if you suspect a leak or if the pressure is too high, it is strongly advised to call a Gas Safe Engineer to diagnose and resolve the issue safely.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing the F52 fault could range from £150 to £300, depending on whether a simple re-pressurisation is needed or if components like the pressure relief valve or expansion vessel require replacement.