What does the Baxi Megaflo E440 fault code mean?
The E440 fault code on a Baxi Megaflo indicates a central heating (CH) pressure fault, typically signifying that the system pressure is either too low or too high. This can lead to inefficient heating performance and may require immediate attention to ensure safe operation.
Common Causes
- Low System Pressure: This can occur due to leaks in the heating system or insufficient water in the system.
- High System Pressure: This may be caused by a faulty pressure relief valve or expansion vessel issues, leading to excessive pressure build-up.
Can I fix it myself? (DIY)
If the pressure is low, you can attempt to repressurise the system using the filling loop, following the manufacturer’s instructions. However, if you suspect a leak or if the pressure is too high, it is crucial to call a Gas Safe Engineer to avoid any safety risks.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing the E440 fault could range from £150 to £300, depending on whether it involves simply repressurising the system or replacing components like a pressure relief valve or expansion vessel.