What does the Glow-worm Flexicom F47 fault code mean?
The F47 fault code on a Glow-worm Flexicom boiler indicates a problem with the expansion vessel, which is responsible for maintaining the pressure within the heating system. A faulty expansion vessel can lead to pressure fluctuations and may cause the boiler to shut down to prevent damage.
Common Causes
- Loss of Air Pressure: The air charge in the expansion vessel may have diminished, leading to inadequate pressure regulation.
- Water Leakage: A leak in the expansion vessel can cause water to enter, compromising its function and leading to system pressure issues.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer to address this issue, as working with gas appliances can be dangerous. Attempting to fix the expansion vessel without proper training may lead to further complications.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for replacing a faulty expansion vessel on a Glow-worm Flexicom boiler is around £200 to £300. This includes the cost of the part and labour, reflecting the complexity of the repair and the need for a qualified technician.