What does the Baxi Megaflo E770 fault code mean?
The E770 fault code on a Baxi Megaflo indicates a fault within the domestic hot water (DHW) system, which may prevent the boiler from providing hot water. This could be due to various issues affecting the operation of the DHW components.
Common Causes
- Faulty DHW Sensor: A malfunctioning sensor can lead to incorrect temperature readings, causing the system to shut down.
- Blocked Heat Exchanger: A blockage can restrict water flow, impacting the efficiency of hot water delivery.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for this issue, as it may involve gas or electrical components that require professional expertise. Attempting DIY repairs could be dangerous.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing the E770 fault could range from £150 to £300, depending on whether a sensor replacement or heat exchanger cleaning is necessary. This estimate reflects the cost of parts and labour for a qualified engineer.