What does the Vaillant F.28 fault code mean?
The Vaillant F.28 fault code indicates an unsuccessful ignition attempt, which may be due to a gas valve issue. This means that the boiler is unable to ignite the gas to produce heat, leading to a lack of hot water or heating.
Common Causes
- Gas Supply Issue: There may be a blockage or interruption in the gas supply to the boiler, preventing it from igniting.
- Faulty Gas Valve: The gas valve may be malfunctioning or stuck, which can prevent the proper flow of gas needed for ignition.
Can I fix it myself? (DIY)
This fault often involves gas components, and it is crucial to have a qualified Gas Safe Engineer assess and repair the issue. Attempting to fix gas-related problems without proper training can be dangerous.
Estimated Repair Cost (2026 UK Prices)
The estimated cost for repairing a Vaillant boiler with an F.28 fault code typically ranges from £150 to £350. This includes approximately £100 to £200 for a replacement gas valve and £50 to £150 for labor, depending on the complexity of the installation.