What does the Glow-worm Flexicom F74 fault code mean?
The F74 fault code on the Glow-worm Flexicom indicates a problem with the boiler’s seasonal adjustment feature, which is responsible for optimising the heating output based on the external temperature. This fault can lead to inefficient heating performance and may require attention to restore proper functionality.
Common Causes
- Faulty Temperature Sensor: A malfunctioning temperature sensor can provide incorrect readings, leading to improper seasonal adjustments.
- Wiring Issues: Damaged or loose wiring connections can disrupt communication between components, causing the seasonal adjustment feature to fail.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for this issue, as it involves electrical components and safety risks. Attempting to fix it yourself could lead to further complications or safety hazards.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F74 fault is around £150 to £250, primarily due to the potential need for replacing the temperature sensor or repairing wiring issues, which can be labour-intensive.