What does the Glow-worm Ultimate F94 fault code mean?
The F94 fault code on the Glow-worm Ultimate indicates a fault with the Domestic Hot Water (DHW) PCB, which is responsible for controlling the hot water supply. This alert suggests that there may be an issue with the electronic control board that manages the hot water function.
Common Causes
- Faulty DHW PCB: The printed circuit board may have developed a fault, leading to improper functioning of the hot water system.
- Wiring Issues: Damaged or loose wiring connections to the DHW PCB can cause communication failures, triggering the fault code.
Can I fix it myself? (DIY)
It is strongly advised to call a Gas Safe Engineer for any repairs related to the DHW PCB, as it involves gas and electrical components that require professional handling. Attempting DIY repairs could pose safety risks.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for replacing the DHW PCB on a Glow-worm Ultimate is around £250 to £350, including parts and labour. This cost reflects the complexity of the repair and the need for a qualified technician to ensure safe and proper installation.