What does the Glow-worm Ultimate F80 fault code mean?
The F80 fault code on the Glow-worm Ultimate indicates an issue with the domestic hot water (DHW) valve. This typically means that the valve is either stuck or not functioning correctly, preventing hot water from being delivered.
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 electrical connections or the actuator that controls the 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 handling for safety reasons.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing the F80 fault code is around £150 to £250. This includes the cost of parts, such as a new DHW valve, and labour for a qualified engineer to diagnose and fix the issue.