What does the Worcester Bosch Greenstar CDi F73 fault code mean?
The F73 fault code on the Worcester Bosch Greenstar CDi indicates a problem with the surge protection system of the boiler. This typically means that the boiler’s electronic components are not receiving stable power, which can lead to operational issues.
Common Causes
- Electrical Surge: A sudden spike in electrical voltage can damage the surge protection components.
- Faulty Circuit Board: A malfunctioning circuit board may fail to regulate power properly, triggering the F73 fault code.
Can I fix it myself? (DIY)
It is highly recommended to call a Gas Safe Engineer for this issue, as it involves electrical components that can be dangerous to handle without proper training.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F73 fault code is around £150 to £250. This includes the cost of replacing any damaged surge protection components and potential circuit board repairs, which can be quite specific and labour-intensive.