What does the Glow-worm Energy F43 fault code mean?
The F43 fault code on a Glow-worm Energy boiler indicates a central heating (CH) flow fault, which typically suggests that there is an issue with the flow of water through the heating system. This can lead to inadequate heating and may require immediate attention to prevent further damage.
Common Causes
- Blocked or Closed Valves: If the flow valves are blocked or closed, it can restrict water flow, triggering the F43 fault code.
- Circulation Pump Failure: A malfunctioning circulation pump may not be able to effectively move water through the system, resulting in a flow fault.
Can I fix it myself? (DIY)
While some minor issues may be resolved by checking and opening valves, it is strongly advised to call a Gas Safe Engineer for any gas or electrical-related problems to ensure safety and compliance with regulations.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing the F43 fault could range from £150 to £300, depending on whether the issue is a simple valve adjustment or requires replacement of the circulation pump, which can be more expensive.