What does the Worcester Bosch Greenstar i F33 fault code mean?
The F33 fault code on the Worcester Bosch Greenstar i indicates a problem with the pressure switch, which is responsible for monitoring the system’s water pressure. This fault can prevent the boiler from operating correctly, leading to heating and hot water issues.
Common Causes
- Blocked Pressure Switch Tubing: Debris or blockages in the tubing connected to the pressure switch can prevent it from functioning properly.
- Faulty Pressure Switch: The pressure switch itself may be defective or worn out, requiring replacement to restore normal operation.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer to diagnose and repair the issue, as working with gas appliances can be dangerous. Attempting to fix the pressure switch without proper training may lead to further complications.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for the F33 fault code is around £150 to £250, which includes the cost of a new pressure switch and labour. This price reflects the complexity of the repair and the need for a qualified technician to ensure safety and compliance with regulations.