What does the Glow-worm Betacom F58 fault code mean?
The F58 fault code on a Glow-worm Betacom boiler indicates a central heating pressure fault, typically meaning that the system pressure is either too low or too high. This can lead to inadequate heating performance and may require immediate attention to ensure safe operation.
Common Causes
- Low System Pressure: This can occur due to leaks in the heating system or when radiators are bled, causing a drop in pressure.
- High System Pressure: This may be caused by a faulty pressure relief valve or an issue with the expansion vessel, leading to excessive pressure in the system.
Can I fix it myself? (DIY)
If the pressure is low, you can attempt to re-pressurise the system using the filling loop. However, if you are unsure or if the issue persists, it is crucial to call a Gas Safe Engineer to diagnose and resolve any gas or electrical issues safely.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing a pressure fault on a Glow-worm Betacom boiler is around £150 to £250. This includes the cost of a Gas Safe Engineer’s visit and potential replacement of parts such as the pressure relief valve or expansion vessel.