What does the Worcester Bosch Greenstar i F40 fault code mean?
The F40 fault code indicates a problem with the gas pressure sensor in the Worcester Bosch Greenstar i boiler. This sensor is crucial for monitoring the gas supply pressure, and its failure can lead to improper combustion and safety issues.
Common Causes
- Faulty Gas Pressure Sensor: The sensor may be malfunctioning or damaged, leading to inaccurate readings.
- Blocked Gas Supply: A blockage in the gas supply line can cause pressure fluctuations, triggering the fault code.
Can I fix it myself? (DIY)
It is highly recommended to call a Gas Safe Engineer to diagnose and repair this issue, as it involves gas and electrical components that can be dangerous if handled improperly.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for the F40 fault code is around £150 to £250, which includes the replacement of the gas pressure sensor and any necessary labour charges. This cost reflects the complexity of the repair and the need for a qualified technician.