What does the Glow-worm Ultimate F72 fault code mean?
The F72 fault code on the Glow-worm Ultimate indicates a problem with the domestic hot water (DHW) flow switch. This error typically means that the boiler is unable to detect the flow of water, which can prevent it from heating water properly.
Common Causes
- Blocked Flow Switch: Debris or limescale buildup can obstruct the flow switch, preventing it from functioning correctly.
- Electrical Fault: Issues with the wiring or connections to the flow switch can lead to incorrect readings and trigger the fault code.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for this issue, as it involves gas and electrical components that require professional handling. Attempting to fix it yourself could pose safety risks.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F72 fault could be around £150 to £250. This includes the potential replacement of the flow switch and any necessary labour charges.