What does the Glow-worm Ultimate F71 fault code mean?
The F71 fault code on the Glow-worm Ultimate indicates a problem with the domestic hot water (DHW) valve, which may be stuck or malfunctioning. This can prevent the boiler from supplying hot water effectively.
Common Causes
- Stuck DHW Valve: The valve may be physically stuck due to debris or wear, preventing it from opening or closing properly.
- Electrical Fault: There could be an issue with the wiring or connections to the DHW valve, leading to a failure in operation.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for this issue, as it involves gas and electrical components that require professional expertise to ensure safety and compliance with regulations.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for fixing the DHW valve issue is around £200 to £300. This includes the cost of parts and labour, as the valve replacement may require specific components and professional installation.