What does the Worcester Bosch Greenstar i F36 fault code mean?
The F36 fault code on the Worcester Bosch Greenstar i indicates a malfunction of the flow switch, which is responsible for detecting water flow through the boiler. This issue can prevent the boiler from operating efficiently or at all, leading to heating and hot water supply problems.
Common Causes
- Blocked Flow Switch: Debris or mineral build-up can obstruct the flow switch, preventing it from functioning correctly.
- Electrical Fault: A wiring issue or a faulty connection can disrupt the signal from the flow switch to the boiler’s control board.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer to address this issue, as working with gas appliances can be dangerous. Attempting to fix electrical components without proper training can also lead to further damage or safety hazards.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for a faulty flow switch on a Worcester Bosch Greenstar i is approximately £150 to £200. This includes the cost of the replacement part and labour, as flow switches typically require professional installation to ensure safety and compliance with regulations.