What does the Vaillant Home F73 fault code mean?
The F73 fault code on a Vaillant Home boiler indicates a problem with the system pressure switch, which is responsible for monitoring the pressure within the heating system. This fault can prevent the boiler from operating correctly, leading to heating or hot water issues.
Common Causes
- Low System Pressure: Insufficient water pressure in the system can trigger the pressure switch fault.
- Faulty Pressure Switch: A malfunctioning pressure switch may not accurately detect the system pressure, causing the error code to appear.
Can I fix it myself? (DIY)
If you are comfortable with basic maintenance, you can check the system pressure and attempt to reset the boiler. However, if the issue persists or if you suspect a faulty component, it is essential to call a Gas Safe Engineer to ensure safety and compliance with regulations.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving an F73 fault could range from £100 to £250, depending on whether the pressure switch needs replacing or if the system requires a pressure refill. This cost reflects the price of parts and labour for a qualified engineer.