What does the Glow-worm Ultimate F79 fault code mean?
The F79 fault code on the Glow-worm Ultimate indicates a problem with the domestic hot water (DHW) pump. This issue can prevent the boiler from effectively circulating hot water, leading to inadequate hot water supply.
Common Causes
- Blocked DHW Pump: Debris or scale buildup can obstruct the pump, preventing it from functioning properly.
- Electrical Fault: Issues with the wiring or connections to the pump can disrupt its operation, leading to the fault code being displayed.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for this issue, as it involves electrical components and potential gas safety risks. Attempting to fix it yourself could lead to further complications or safety hazards.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing the F79 fault could range from £150 to £300, depending on whether the pump needs cleaning or replacement. This cost includes parts and labour for a qualified engineer to ensure safe and effective repairs.