What does the Worcester Bosch Greenstar Si F43 fault code mean?
The F43 fault code on the Worcester Bosch Greenstar Si indicates a problem with the heating sensor, which is responsible for monitoring the temperature of the heating system. This fault can lead to inefficient heating or the boiler shutting down to prevent damage.
Common Causes
- Faulty Heating Sensor: The sensor may be defective or malfunctioning, leading to incorrect temperature readings.
- Wiring Issues: Damaged or loose wiring connections to the heating sensor can disrupt its function and trigger the fault code.
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 the F43 fault code is around £150 to £250, which includes the replacement of the heating sensor and any necessary labour. This estimate reflects the cost of parts and the expertise required for safe installation.