What does the Vaillant ecoTEC plus F28 fault code mean?
The F28 fault code on a Vaillant ecoTEC plus boiler indicates that there is no gas supply to the appliance. This can prevent the boiler from igniting and functioning properly, leading to a lack of heating and hot water.
Common Causes
- Gas Supply Issue: There may be a problem with the gas supply to the boiler, such as a shut-off valve being closed or a gas leak.
- Faulty Gas Valve: The gas valve itself may be malfunctioning, preventing gas from reaching the burner.
Can I fix it myself? (DIY)
It is recommended to check if the gas supply is turned on and that the gas meter is functioning correctly. However, due to the potential dangers associated with gas appliances, it is strongly advised to call a Gas Safe Engineer for any gas-related issues.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving an F28 fault could range from £150 to £300, depending on whether the issue is a simple gas supply problem or if a new gas valve needs to be installed.