What does the Glow-worm Energy F55 fault code mean?
The F55 fault code indicates a problem with the domestic hot water (DHW) flow switch in the Glow-worm Energy boiler. This fault typically means that the boiler is unable to detect water flow, which can prevent it from heating water properly.
Common Causes
- Blocked Flow Switch: Debris or mineral build-up can obstruct the flow switch, preventing it from functioning correctly.
- Faulty Flow Switch: The flow switch itself may be defective or worn out, leading to inaccurate readings and triggering the fault code.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer to diagnose and repair this issue, as working on gas appliances can be dangerous and requires professional expertise.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F55 fault code is around £150 to £250, which includes the replacement of the flow switch and associated labour costs. This estimate reflects the typical price for parts and professional service in the UK.