What does the Viessmann Vitodens 111-W F28 fault code mean?
The F28 fault code on the Viessmann Vitodens 111-W indicates an ignition failure, meaning the boiler is unable to ignite the gas to start the heating process. This can lead to a lack of hot water and heating in your home.
Common Causes
- Insufficient Gas Supply: If there is a blockage or issue with the gas supply, the boiler may not receive the necessary gas to ignite.
- Faulty Ignition Electrode: A malfunctioning ignition electrode can prevent the boiler from igniting, leading to the F28 error code.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for any issues related to gas or electrical components. Attempting to fix these problems without proper training can be dangerous.
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 blockage or requires replacement of the ignition electrode, which can be more expensive.