What does the Glow-worm Ultimate F84 fault code mean?
The F84 fault code on the Glow-worm Ultimate indicates an electrical issue related to the domestic hot water (DHW) system. This typically suggests a problem with the wiring or components that control the DHW function.
Common Causes
- Wiring Issues: Damaged or loose wiring connections can disrupt the electrical flow necessary for the DHW system to operate correctly.
- Faulty DHW Sensor: A malfunctioning sensor may fail to provide accurate temperature readings, leading to the F84 fault code being triggered.
Can I fix it myself? (DIY)
It is highly recommended to call a Gas Safe Engineer for this issue, as it involves electrical components that can be dangerous if mishandled. Attempting DIY repairs could lead to further damage or safety hazards.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F84 fault code is around £150 to £250. This includes potential replacement of wiring or the DHW sensor, which are common components that may need attention.