What does the Ideal Mini F66 fault code mean?
The F66 fault code on the Ideal Mini boiler indicates a central heating system pressure fault, typically meaning that the pressure in the system is either too low or too high. This can prevent the boiler from operating efficiently and may lead to further issues if not addressed promptly.
Common Causes
- Low Water Pressure: This can occur due to leaks in the system or insufficient water in the boiler.
- High Water Pressure: This may be caused by a faulty pressure relief valve or expansion vessel issues.
Can I fix it myself? (DIY)
If the pressure is low, you can attempt to repressurise the system by using the filling loop. However, if you are unsure or if the issue persists, it is strongly advised to call a Gas Safe Engineer to avoid any gas or electrical hazards.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing the F66 fault could range from £100 to £250, depending on whether it’s a simple pressure adjustment or if parts like the pressure relief valve or expansion vessel need replacement.