What does the Vaillant ecoTEC plus F37 fault code mean?
The F37 fault code on the Vaillant ecoTEC plus indicates a malfunction with the pressure switch, which is responsible for monitoring the system’s water pressure. This issue can prevent the boiler from operating correctly, leading to heating and hot water supply problems.
Common Causes
- Blocked Pressure Switch Tube: A blockage in the tube connecting the pressure switch to the system can cause incorrect pressure readings.
- Faulty Pressure Switch: The pressure switch itself may be defective or worn out, leading to failure in detecting the correct pressure levels.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer to diagnose and repair the issue, as working on gas appliances can be dangerous. Attempting to fix the pressure switch without proper training may lead to further complications.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for a faulty pressure switch on a Vaillant ecoTEC plus is around £150 to £250, including parts and labour. This cost reflects the price of the replacement part and the expertise required for safe installation.