What does the Baxi Platinum F90 fault code mean?
The F90 fault code on a Baxi Platinum boiler indicates a fault with the domestic hot water (DHW) flow rate sensor. This issue can prevent the boiler from properly detecting water flow, leading to inadequate hot water supply.
Common Causes
- Faulty Flow Rate Sensor: The sensor may be malfunctioning or damaged, resulting in incorrect readings.
- Blocked Pipework: Obstructions in the water pipes can affect flow rate and lead to sensor errors.
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 be dangerous.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for replacing a faulty flow rate sensor on a Baxi Platinum boiler is approximately £150 to £200. This includes the cost of the part and labour, reflecting the complexity of the repair.