What does the Glow-worm Flexicom F63 fault code mean?
The F63 fault code on the Glow-worm Flexicom indicates a malfunction with the high limit thermostat, which is responsible for preventing the boiler from overheating. When this component fails, it can lead to unsafe operating conditions, prompting the boiler to shut down for safety reasons.
Common Causes
- Faulty High Limit Thermostat: The thermostat may be defective or have failed due to age or wear, causing it to incorrectly signal the boiler.
- Electrical Issues: Wiring problems or poor connections can prevent the thermostat from functioning properly, leading to the fault code being triggered.
Can I fix it myself? (DIY)
It is highly 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 replacing a faulty high limit thermostat on a Glow-worm Flexicom is around £150 to £200. This includes the cost of the part and labour, as it requires a qualified engineer to ensure safe and correct installation.