Glow-worm · Energy
F.24 boiler fault code
Energy
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What F.24 means
Safety switch-off: the temperature is rising too quickly.
Safe check
Record the exact display and model from the outside label or manual. Do not open the boiler or attempt an internal sensor or pump check.
When to contact an engineer
Contact a Gas Safe registered engineer if this code appears or returns; diagnosis may involve internal circulation and temperature checks.
Safety notice
A boiler fault code alone is not a gas or carbon-monoxide emergency. If you smell gas, a CO alarm sounds, anyone feels unwell, or there is an unsafe flame, leave and call 0800 111 999 from outside.
Source and provenance
- Energy range fault codes
manufacturer trade support table
Checked 27 September 2026; the online page publishes no revision