What does the Baxi Platinum F66 fault code mean?
The F66 fault code on a Baxi Platinum boiler indicates that the domestic hot water (DHW) flow rate is too high for the system to manage effectively. This can lead to issues with water temperature regulation and overall boiler performance.
Common Causes
- High Demand for Hot Water: If multiple outlets are being used simultaneously, the flow rate may exceed the boiler’s capacity.
- Faulty Flow Sensor: A malfunctioning flow sensor may incorrectly report high flow rates, triggering the fault code.
Can I fix it myself? (DIY)
It is advisable to call a Gas Safe Engineer to diagnose and resolve this issue, as it may involve gas or electrical components that require professional expertise.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing the F66 fault could be around £150 to £250, depending on whether the issue is due to a faulty flow sensor or requires adjustments to the system to manage water flow rates.