What does the Baxi Megaflo E740 fault code mean?
The E740 fault code on a Baxi Megaflo indicates a central heating (CH) system reset fault. This typically means that the boiler has detected an issue that requires a reset to restore normal operation.
Common Causes
- Low Water Pressure: Insufficient water pressure in the system can trigger a reset fault, preventing the boiler from functioning properly.
- Faulty Sensors: Malfunctioning temperature or pressure sensors may incorrectly signal the boiler to reset, leading to the E740 code.
Can I fix it myself? (DIY)
If you are comfortable, check the boiler’s pressure gauge and ensure it is within the recommended range (typically 1-1.5 bar). If the pressure is low, you can top it up using the filling loop. However, for any gas or electrical issues, it is crucial to call a Gas Safe Engineer.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing the E740 fault could be around £150-£200, primarily for sensor replacement or pressure adjustments. This cost reflects the typical labour and parts needed for such repairs.