Low Information
NEON4 on Glow-worm Hideaway 100

Your boiler is currently operating normally and the burner is ignited as it should be to provide heat.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description

BURNER LIT

What causes this fault?

This is not actually a fault, but a status indicator confirming that the gas burner has successfully ignited. It appears when the boiler's internal sensors detect a flame and confirm that the unit is actively heating water for your radiators or taps. As long as this light is on, the boiler is performing its primary function exactly as intended.

DIY fix possible

No action is required as this is a status indicator, not an error.Ensure your thermostat is set to the desired temperature.Check that your programmer is set to an 'on' period.

Find a Gas Safe engineer
Search the official register →

Related fault codes

NEON 1View →NEON 2View →NEON 3View →NEON 5View →

Related guides you might find useful

Is boiler cover worth it?

Break-even maths on monthly cover.

Read →

When to replace your boiler

7 signs repair isn't worth it anymore.

Read →

New boiler cost 2026

Realistic UK prices for a swap.

Read →