Your boiler is operating normally and is currently heating your home or water.
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: Illuminates to indicate that the pilot flame and main burner are lit.
What causes this fault?
This is not actually a fault, but a status indicator confirming that the boiler has successfully ignited. It shows that the internal gas valve has opened and the burner is currently producing the heat required for your central heating or hot water. If this light is on, it means the system is functioning exactly as it should be.
DIY fix possible
This fault may be fixable without an engineer. Check your manual first.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Protect yourself from future repair bills
A boiler cover plan would cover faults like Burner On Neon — no call-out fees, no surprises.
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Potterton Osprey 2 CFL 125 is discontinued — time for a new one?
Parts for discontinued models can be hard to find and expensive. A new A-rated boiler could save you money on both repairs and energy bills.
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