What does the Vaillant ecoFIT pure F40 fault code mean?
The F40 fault code on the Vaillant ecoFIT pure indicates a malfunction with the gas pressure switch. This issue typically arises when the switch fails to detect the correct gas pressure, which can affect the boiler’s operation.
Common Causes
- Blocked Gas Supply: A blockage in the gas supply line can prevent the correct pressure from reaching the boiler.
- Faulty Gas Pressure Switch: The gas pressure switch itself may be defective or damaged, leading to inaccurate readings.
Can I fix it myself? (DIY)
It is highly recommended to call a Gas Safe Engineer for any issues related to gas pressure switches, as they involve gas and electrical components that can be dangerous if handled improperly.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for a faulty gas pressure switch on a Vaillant ecoFIT pure is approximately £150 to £250. This includes the cost of the part and labour, as gas components require professional handling.