What does the Glow-worm Ultimate F48 fault code mean?
The F48 fault code on the Glow-worm Ultimate indicates a domestic hot water (DHW) electrical fault. This typically suggests an issue with the wiring or components related to the DHW system, which may prevent the boiler from providing hot water.
Common Causes
- Wiring Issues: Damaged or loose wiring connections can disrupt the electrical flow necessary for the DHW system to function properly.
- Faulty DHW Sensor: A malfunctioning sensor may fail to detect water temperature correctly, leading to the F48 fault code being triggered.
Can I fix it myself? (DIY)
It is strongly advised to call a Gas Safe Engineer for this issue, as it involves electrical components that can be hazardous if not handled correctly. Attempting to fix electrical faults without proper training can pose serious safety risks.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving an F48 fault could be around £150 to £250, depending on whether wiring repairs or component replacements are needed. This cost reflects the complexity of diagnosing and fixing electrical faults in boiler systems.