What does the Glow-worm Energy F23 fault code mean?
The F23 fault code indicates a flame failure in the Glow-worm Energy boiler, meaning the appliance is unable to detect a flame when it attempts to ignite. This can lead to the boiler shutting down to prevent unsafe operation.
Common Causes
- Blocked Flue: A blockage in the flue system can prevent proper ventilation, leading to flame failure.
- Faulty Ignition Electrode: If the ignition electrode is damaged or malfunctioning, it may not create a spark to ignite the gas.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for any gas or electrical issues. However, you can check the boiler pressure and reset the boiler if it is low or has tripped.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F23 fault could be around £150-£250, primarily depending on whether the ignition electrode needs replacement or if the flue requires clearing.