What does the Viessmann Vitodens 050-W E236 fault code mean?
The E236 fault code on the Viessmann Vitodens 050-W indicates a problem with the ignition transformer, which is responsible for generating the high voltage needed to ignite the gas burner. This fault can prevent the boiler from starting or cause it to shut down during operation.
Common Causes
- Faulty Ignition Transformer: The ignition transformer may have failed due to wear and tear or electrical issues, leading to insufficient voltage for ignition.
- Electrical Connections: Loose or damaged wiring connections to the ignition transformer can disrupt the ignition process, causing the fault code to appear.
Can I fix it myself? (DIY)
It is strongly advised to call a Gas Safe Engineer for any issues related to gas or electrical components, including the ignition transformer. Attempting to fix it yourself can be dangerous and may void any warranties.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for replacing a faulty ignition transformer on a Viessmann Vitodens 050-W is approximately £200 to £300. This includes the cost of the part and labour, as ignition transformers are specialized components that require professional installation.