What does the Glow-worm Energy F80 fault code mean?
The F80 fault code on a Glow-worm Energy boiler indicates a problem with the central heating (CH) expansion vessel. This issue typically arises when the vessel is either waterlogged or has lost its pre-charge pressure, affecting the boiler’s ability to maintain proper pressure levels.
Common Causes
- Waterlogging: This occurs when the diaphragm inside the expansion vessel fails, allowing water to fill the vessel and preventing it from absorbing pressure changes.
- Loss of Pre-charge Pressure: The pre-charge pressure in the expansion vessel may drop over time, leading to insufficient capacity to manage the expansion of water in the heating system.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer to address this issue, as it involves working with pressurised systems and potentially hazardous components. Attempting to fix it yourself could lead to further damage or safety risks.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing an F80 fault code is around £150 to £250. This includes the cost of replacing the expansion vessel and any associated labour, which is necessary to ensure the boiler operates safely and efficiently.