What does the Glow-worm Energy F47 fault code mean?
The F47 fault code indicates a central heating (CH) overheat condition in the Glow-worm Energy boiler. This safety feature activates to prevent damage to the system by shutting down the boiler when it detects excessive temperatures.
Common Causes
- Blocked Heat Exchanger: A buildup of debris or limescale can restrict water flow, causing overheating.
- Faulty Thermostat: If the thermostat is malfunctioning, it may not accurately regulate the temperature, leading to overheating.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer to diagnose and repair this issue, as it involves gas and electrical components that can be dangerous if handled improperly.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing the F47 fault could be around £150 to £300, depending on whether the issue is a simple thermostat replacement or a more complex heat exchanger cleaning or replacement.