What does the Glow-worm Energy F84 fault code mean?
The F84 fault code indicates an issue with the central heating (CH) air vent, which may be preventing proper circulation of water in the system. This can lead to heating inefficiencies or complete system failure if not addressed.
Common Causes
- Blocked Air Vent: Debris or sludge may be obstructing the air vent, preventing it from functioning correctly.
- Faulty Pressure Sensor: A malfunctioning pressure sensor can misread the system pressure, triggering the F84 fault code.
Can I fix it myself? (DIY)
If you are experienced with boiler maintenance, you can try bleeding the radiators to release trapped air. However, for any gas or electrical issues, it is crucial to call a Gas Safe Engineer to ensure safety and compliance with regulations.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving an F84 fault is around £150 to £200, primarily for labour and potential replacement of the air vent or pressure sensor. This cost reflects the complexity of diagnosing and fixing the issue safely.