BoilerFaultCodesGlow-worm Burner On Neon Fault Code
Also written as BURNERONNEON — same fault.
The Glow-worm Burner On Neon fault code means: your boiler is operating normally and is currently heating the water for your radiators or hot water tank.. It appears on 4 Glow-worm models in our database.
Technical description: Neon on the control panel lighting up shows the burner is alight.
What causes the Glow-worm Burner On Neon fault?
This is not a fault, but rather a status indicator showing that the boiler has successfully ignited its main burner. It occurs when the internal thermostat or your external programmer sends a signal for heat, triggering the gas valve to open and the spark to light the fuel. As long as this light is on, your boiler is actively burning gas to heat your home or water cylinder.
This light will be visible more frequently during the winter months when your heating is scheduled to run for longer periods to maintain a comfortable temperature.
DIY fix possible
No action is required as this is a status indicator, not a fault code.Check that your thermostat is set to the desired temperature.Ensure your programmer is set to 'On' if you require heating.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Glow-worm models that show the Burner On Neon fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Glow-worm Burner On 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