What does the Baxi Platinum F84 fault code mean?
The F84 fault code on a Baxi Platinum boiler indicates that the domestic hot water (DHW) flow temperature is too low, which can affect the performance of the hot water supply. This issue may arise due to various factors, including sensor malfunctions or flow restrictions.
Common Causes
- Faulty DHW Temperature Sensor: If the sensor is malfunctioning, it may not accurately read the water temperature, leading to incorrect readings and the F84 fault code.
- Blocked Heat Exchanger: A blockage in the heat exchanger can restrict the flow of water, preventing it from reaching the desired temperature.
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 handling. Attempting to fix it yourself could pose safety risks.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing the F84 fault code is around £150 to £250, primarily due to the potential need for replacing the DHW temperature sensor or cleaning the heat exchanger, which requires professional expertise.