What does the Glow-worm Energy F90 fault code mean?
The F90 fault code on a Glow-worm Energy boiler indicates a central heating ignition fault. This typically means that the boiler is unable to ignite the burner, preventing it from providing heat to the system.
Common Causes
- Blocked Flue: A blockage in the flue system can prevent proper ventilation, leading to ignition issues.
- Faulty Ignition Electrode: If the ignition electrode is damaged or malfunctioning, it may not create the spark needed to ignite the gas.
Can I fix it myself? (DIY)
It is highly recommended to call a Gas Safe Engineer for any gas or electrical issues, including ignition faults. Attempting to fix these problems without proper training can be dangerous.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving an F90 fault could be around £150 to £250, primarily depending on whether the ignition electrode needs replacing or if there are flue obstructions that require clearing.