What does the Viessmann Vitodens 100-W F28 fault code mean?
The F28 fault code indicates an ignition failure in the Viessmann Vitodens 100-W boiler. This typically means that the boiler is unable to ignite the gas, preventing it from heating water.
Common Causes
- Gas Supply Issue: There may be a problem with the gas supply, such as a closed valve or a gas leak.
- Electrode or Ignition Lead Fault: The ignition electrode or lead may be damaged or dirty, preventing proper ignition.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for any gas-related issues, including ignition failures. Attempting to fix gas appliances 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 adjustment or requires replacement of ignition components.