What does the Baxi Platinum F81 fault code mean?
The F81 fault code on a Baxi Platinum boiler indicates that the central heating (CH) supply temperature is excessively high. This can lead to overheating and potential damage to the boiler if not addressed promptly.
Common Causes
- Faulty Thermistor: A malfunctioning thermistor may incorrectly read the temperature, causing the boiler to overheat.
- Blocked Heat Exchanger: A blockage in the heat exchanger can restrict water flow, leading to increased temperatures in the system.
Can I fix it myself? (DIY)
It is advisable to call a Gas Safe Engineer to diagnose and repair the issue, as working with gas appliances can be dangerous. Attempting to fix gas or electrical components without proper training can pose serious risks.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing the F81 fault could range from £150 to £300, depending on whether the thermistor needs replacing or if the heat exchanger requires cleaning. This cost reflects the complexity of the repairs and the need for professional expertise.