BoilerFaultCodesGlow-worm red lockout neon Fault Code
Also written as REDLOCKOUTNEON — same fault.
The Glow-worm red lockout neon fault code means: your boiler has stopped working for safety reasons and needs to be reset to try and fire up again.. It appears on 1 Glow-worm model in our database.
Technical description: Indicates a lockout fault; requires pressing the reset switch and waiting 15 seconds between attempts.
What causes the Glow-worm red lockout neon fault?
This fault happens when the boiler attempts to start up but fails to detect a steady flame, causing it to shut down for safety. It is usually caused by a lack of fuel reaching the burner or a component failing to generate the spark needed to ignite the gas. In some cases, the boiler may actually be lighting, but a faulty sensor is failing to tell the internal computer that the flame is present.
DIY fix possible
Locate the reset switch on the control panelPress and release the reset switchWait at least 15 seconds for the boiler to attempt to restart
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Gas Safe Register →Glow-worm models that show the red lockout neon fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Glow-worm red lockout neon 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 27 April 2026