BoilerFaultCodesGlow-worm Ignition Lockout Fault Code
Also written as IGNITIONLOCKOUT — same fault.
The Glow-worm Ignition Lockout fault code means: your boiler is trying to start but the flame isn't catching, so it has safely disabled itself to prevent gas waste.. It appears on 1 Glow-worm model in our database.
Technical description: Boiler failed to ignite
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Glow-worm models that show the Ignition Lockout fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Glow-worm Ignition Lockout 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