BoilerFaultCodesGlow-worm F29 Fault Code
The Glow-worm F29 fault code means: your boiler was working but the flame has unexpectedly gone out, causing the system to stop for safety.. It appears on 1 Glow-worm model in our database.
Technical description: Loss of flame during operation
DIY fix possible
Check if other gas appliances in your home, like a hob, are working to confirm gas supply.If it is freezing outside, check if the white plastic condensate pipe leading outdoors is frozen and thaw it with warm water.Press the reset button (flame symbol with a cross) for five seconds to restart the boiler.
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Glow-worm models that show the F29 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Glow-worm F29 fault code information on this page is sourced and cross-checked against the official Glow-worm service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026