F.25
Glow-worm fault code
Glow-worm F.25: safety switch-off: flue gas temperature too high
Engineer only
The boiler has shut down because of a flue gas temperature fault. Flue faults are always a job for an engineer.
What you can safely do
There is nothing you can safely do yourself with this one. Leave the boiler off and book an engineer.
Call a Gas Safe engineer if
- Book a Gas Safe registered engineer.
- If anyone feels unwell (headache, dizziness, nausea), get fresh air and call 0800 111 999.
Find a Gas Safe engineer near you
Opens the official Gas Safe Register search.
Applies to: Energy range. Codes can differ between models, so check your manual.