What does the Glow-worm Ultimate F58 fault code mean?
The F58 fault code on the Glow-worm Ultimate indicates a failure in the Domestic Hot Water (DHW) PCB (Printed Circuit Board). This issue typically affects the boiler’s ability to provide hot water, necessitating a diagnosis and potential replacement of the PCB.
Common Causes
- PCB Failure: The PCB may have developed a fault due to electrical issues, overheating, or component wear over time.
- Wiring Issues: Damaged or loose wiring connections to the PCB can lead to communication failures, resulting in the F58 error code.
Can I fix it myself? (DIY)
It is strongly advised to call a Gas Safe Engineer for this issue, as working with gas and electrical components can be dangerous. Attempting to fix the PCB or related wiring without proper training may lead to further damage or safety hazards.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for replacing the DHW PCB on a Glow-worm Ultimate is approximately £250 to £350. This includes the cost of the part and labour, reflecting the complexity of the repair and the need for a qualified engineer.