What does the Baxi Platinum F57 fault code mean?
The F57 fault code on the Baxi Platinum indicates a high limit thermostat fault, which means the boiler has detected that the temperature has exceeded safe operating limits. This safety feature is designed to prevent overheating and potential damage to the system.
Common Causes
- Faulty High Limit Thermostat: The thermostat may be malfunctioning or stuck, causing it to incorrectly signal high temperatures.
- Blocked Heat Exchanger: A blockage in the heat exchanger can prevent proper heat dissipation, leading to overheating and triggering the fault code.
Can I fix it myself? (DIY)
It is strongly advised to call a Gas Safe Engineer to diagnose and repair this issue, as it involves gas and electrical components that can be dangerous if handled improperly.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing the F57 fault code is around £150 to £250, primarily for replacing the high limit thermostat and any necessary labour charges. This cost reflects the complexity of the repair and the need for a qualified technician.