Your boiler is working normally and currently providing heating or hot water as requested.
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: RUNNING
What causes this fault?
This is not a fault; the green light indicates that the boiler's internal controls have successfully received a signal to operate. It physically confirms that the burner is lit and the system is currently delivering heat to your radiators or hot water to your taps. If this light is on, the boiler is performing its job exactly as intended.
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 Green Light — no call-out fees, no surprises.
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Glow-worm Swift Flow 100 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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