What does the Baxi 600 Series E780 fault code mean?
The E780 fault code on the Baxi 600 Series indicates a problem with the domestic hot water (DHW) fan. This fault typically suggests that the fan is either malfunctioning or not operating as intended, which can affect the boiler’s ability to provide hot water.
Common Causes
- Faulty DHW Fan: The fan may be defective or have electrical issues preventing it from functioning properly.
- Blocked Ventilation: Obstructions in the flue or ventilation system can hinder the fan’s operation, leading to this fault code.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for this issue, as it involves electrical components and gas safety regulations. Attempting to fix it yourself could pose safety risks.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for the E780 fault could be around £150 to £250, primarily due to the potential need for a new DHW fan and associated labour costs. This estimate reflects the complexity of the repair and the necessity for professional expertise.