What does the Glow-worm Flexicom F59 fault code mean?
The F59 fault code on a Glow-worm Flexicom boiler indicates a problem with the pressure relief valve, which is responsible for releasing excess pressure from the system. This fault can lead to safety issues and may prevent the boiler from operating correctly.
Common Causes
- Blocked Pressure Relief Valve: Debris or mineral build-up can obstruct the valve, preventing it from functioning properly.
- Faulty Valve Mechanism: The valve may be damaged or worn out, leading to failure in its operation.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for this issue, as working with gas appliances can be dangerous. Attempting to fix the pressure relief valve without proper training may lead to further complications.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for replacing a faulty pressure relief valve on a Glow-worm Flexicom boiler is around £150 to £250. This includes the cost of the part and labour, reflecting the complexity of the repair and the need for a qualified technician.