What does the Baxi Platinum F43 fault code mean?
The F43 fault code on a Baxi Platinum boiler indicates a central heating (CH) temperature fault, which typically means that the boiler is unable to reach or maintain the desired temperature for the central heating system. This can lead to inadequate heating performance and may require immediate attention.
Common Causes
- Faulty Temperature Sensor: The temperature sensor may be malfunctioning, causing incorrect readings and preventing the boiler from operating correctly.
- Blocked Heat Exchanger: A blockage in the heat exchanger can restrict water flow, leading to temperature discrepancies and triggering the fault code.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for this issue, as it involves gas and electrical components that require professional expertise. Attempting DIY repairs could pose safety risks.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing the F43 fault could range from £150 to £300, depending on whether the temperature sensor needs replacement or if the heat exchanger requires cleaning or repair. This estimate includes parts and labour.