What does the Baxi Megaflo E510 fault code mean?
The E510 fault code on a Baxi Megaflo indicates a problem with the domestic hot water (DHW) system pressure. This typically means that the system pressure is either too low or too high, affecting the boiler’s ability to operate efficiently.
Common Causes
- Low System Pressure: This can occur due to leaks in the system or insufficient water in the boiler.
- High System Pressure: This may be caused by a faulty pressure relief valve or expansion vessel issues.
Can I fix it myself? (DIY)
You can check the pressure gauge on the boiler; it should typically be between 1-1.5 bar. If the pressure is low, you can top it up using the filling loop. However, if you suspect a leak or if the pressure is too high, it is advisable to call a Gas Safe Engineer.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing the E510 fault could range from £150 to £300, depending on whether it requires a simple pressure adjustment or replacement of components like the pressure relief valve.