What does the Baxi Megaflo E400 fault code mean?
The E400 fault code on a Baxi Megaflo indicates a problem with the central heating (CH) temperature sensor. This fault typically suggests that the sensor is either malfunctioning or has failed, leading to incorrect temperature readings.
Common Causes
- Faulty Temperature Sensor: The sensor may be damaged or worn out, causing it to provide inaccurate readings.
- Wiring Issues: Damaged or loose wiring connections to the sensor can disrupt its functionality and lead to the fault code being displayed.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer to address this issue, as it involves electrical components and potential safety risks. Attempting to fix it yourself may void warranties or lead to further complications.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for replacing the CH temperature sensor on a Baxi Megaflo is around £150 to £200. This includes the cost of the part and labour, as sensor replacement typically requires professional expertise.