What does the Viessmann Vitodens 050-W E240 fault code mean?
The E240 fault code on the Viessmann Vitodens 050-W indicates a malfunction of the high limit switch, which is a safety device that prevents the boiler from overheating. When this switch fails, it can disrupt the boiler’s operation and may lead to unsafe conditions.
Common Causes
- Faulty High Limit Switch: The switch itself may be defective or worn out, causing it to fail to operate correctly.
- Overheating Issues: If the boiler is overheating due to poor circulation or a blocked heat exchanger, it can trigger the high limit switch to activate.
Can I fix it myself? (DIY)
It is strongly advised to call a Gas Safe Engineer to diagnose and repair this issue, as it involves gas and electrical components that can be dangerous if handled improperly.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for replacing a faulty high limit switch on a Viessmann Vitodens 050-W is around £150 to £250. This includes the cost of the part and labour, as it requires a qualified engineer to ensure safety and compliance with regulations.