Your boiler is working normally and the light simply indicates it is switched on and firing.
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: Neon indicating boiler status: Boiler is operational
What causes this fault?
This indicator is not a fault, but rather a confirmation that the boiler's internal controls have successfully received a demand for heat and the burner is currently firing. It shows that the electrical circuit is complete and the gas valve is open, allowing the unit to heat your water or radiators. You will see this light whenever the system is operating as intended.
DIY fix possible
This fault may be fixable without an engineer. Check your manual first.
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