What does the Glow-worm Ultimate F43 fault code mean?
The F43 fault code on the Glow-worm Ultimate indicates a fault with the domestic hot water (DHW) pump. This typically means that the pump is either not operating correctly or has failed, affecting the boiler’s ability to provide hot water.
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 lead to a failure in operation.
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 damage or safety hazards.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for the F43 fault could be around £150 to £250, primarily for replacing the DHW pump and any associated electrical components. This cost reflects the complexity of the repair and the need for a qualified technician.