What does the Glow-worm Energy F89 fault code mean?
The F89 fault code on the Glow-worm Energy boiler indicates a domestic hot water (DHW) ignition fault. This typically means that the boiler is unable to ignite the burner for hot water production, which can lead to a lack of hot water supply.
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 fail to create the spark needed for ignition.
Can I fix it myself? (DIY)
It is highly recommended to call a Gas Safe Engineer for any gas or electrical issues, as working on boilers can be dangerous. However, you can check the pressure gauge and reset the boiler if the pressure is low or if it has locked out.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving an F89 fault could be around £150 to £250, depending on whether the ignition electrode needs replacing or if there are flue issues that require attention.