What does the Glow-worm Energy F87 fault code mean?
The F87 fault code on a Glow-worm Energy boiler indicates a domestic hot water (DHW) combustion fault. This typically means that the boiler is unable to ignite or maintain combustion for the hot water supply.
Common Causes
- Blocked Flue: A blockage in the flue system can prevent proper ventilation, leading to combustion issues.
- Faulty Ignition Electrode: If the ignition electrode is damaged or malfunctioning, it may fail to ignite the gas properly.
Can I fix it myself? (DIY)
It is strongly advised to call a Gas Safe Engineer for any gas or electrical issues related to the boiler. Attempting to fix these problems without proper training can be dangerous.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F87 fault could be around £150 to £250, depending on whether the issue is a blocked flue or a faulty ignition electrode that needs replacement.