BoilerFaultCodesYour boiler is receiving electrical power and is currently functioning normally, as this light is a status indicator rather than a fault.
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: Mains electricity on
What causes this fault?
This LED is not actually a fault, but an indicator that your boiler is connected to the mains electricity and receiving power. It signifies that the internal control board is live and ready to operate the heating or hot water when called upon. If this is the only light visible, it confirms the unit is in a standard standby or operational state.
DIY fix possible
This fault may be fixable without an engineer. Check your manual first.
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A boiler cover plan would cover faults like LED4 — no call-out fees, no surprises.
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