What does the Glow-worm Ultimate F27 fault code mean?
The F27 fault code on the Glow-worm Ultimate indicates a water flow fault, which typically means that the boiler is not detecting adequate water flow through the system. This can lead to overheating and potential damage if not addressed promptly.
Common Causes
- Blocked Filter: A blockage in the system filter can restrict water flow, triggering the F27 fault code.
- Faulty Pump: If the circulation pump is malfunctioning or has failed, it may not be able to circulate water effectively, leading to this error.
Can I fix it myself? (DIY)
If you are comfortable with basic plumbing, you can check and clean the system filter. However, for issues related to the pump or any gas/electrical components, it is crucial to call a Gas Safe Engineer to ensure safety and compliance with regulations.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving an F27 fault could range from £150 to £300, depending on whether the issue is a simple filter clean or a more complex pump replacement, which typically costs more due to parts and labour.