What does the Worcester Bosch Greenstar CDi F37 fault code mean?
The F37 fault code indicates a problem with the thermistor, which is responsible for measuring the temperature of the water in the heating system. A faulty thermistor can lead to incorrect temperature readings, affecting the boiler’s performance and efficiency.
Common Causes
- Faulty Thermistor: The thermistor may have failed due to wear and tear or exposure to extreme temperatures.
- Wiring Issues: Damaged or loose wiring connections to the thermistor can cause incorrect readings or complete failure.
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 electrical components without proper training can also pose safety risks.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for replacing a faulty thermistor on a Worcester Bosch Greenstar CDi is around £150 to £200. This includes the cost of the part and labour, reflecting the typical pricing for professional service in the UK.