What does the Glow-worm Energy F74 fault code mean?
The F74 fault code indicates a problem with the central heating (CH) supply temperature, suggesting that the boiler is unable to reach or maintain the desired temperature for the heating system. This can lead to inadequate heating performance in the property.
Common Causes
- Faulty Temperature Sensor: The temperature sensor may be malfunctioning, providing inaccurate readings to the boiler’s control system.
- Blocked Heat Exchanger: A blockage in the heat exchanger can restrict water flow, preventing the boiler from heating water effectively.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for any issues related to gas or electrical components. Attempting to fix these problems without proper training can be dangerous.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing the F74 fault could be around £150 to £250, primarily depending on whether the temperature sensor needs replacement or if the heat exchanger requires cleaning or servicing.