What does the Worcester Bosch Greenstar Ri F42 fault code mean?
The F42 fault code indicates a problem with the pressure relief valve in the Worcester Bosch Greenstar Ri boiler. This issue can prevent the boiler from operating correctly, potentially leading to overheating or pressure build-up.
Common Causes
- Faulty Pressure Relief Valve: The valve may be stuck or malfunctioning, causing it to fail to release excess pressure.
- Blocked or Leaking Pipework: Obstructions or leaks in the system can lead to pressure fluctuations, triggering the fault code.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer to address this issue, as working on gas appliances can be dangerous. Attempting to fix the pressure relief valve without proper training may lead to further complications.
Estimated Repair Cost (2026 UK Prices)
The estimated cost for repairing or replacing a faulty pressure relief valve is around £150 to £250. This includes parts and labour, as the valve itself typically costs between £50 and £100, with the remainder covering the engineer’s time.