F28 High

Glow-worm F28 Fault Code

The Glow-worm F28 fault code means: your boiler is not receiving enough gas or cannot create a flame to start the heating process.. It appears on 1 Glow-worm model in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Burner fails to ignite
Typical repair cost £100-£350 (including labour)

DIY fix possible

Check if your gas prepay meter has creditEnsure your main gas stopcock is turned to the 'on' positionCheck if other gas appliances, like a hob, are working correctlyPress the reset button (flame symbol with a cross) for five seconds

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Glow-worm models that show the F28 fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Glow-worm F28 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