BoilerFaultCodesYour boiler has electrical power and is ready to operate as normal; 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 is not a fault, but a signal that your boiler is receiving electrical power from your home's mains supply. It indicates that the internal control board is live and the appliance is ready to start the ignition sequence as soon as your thermostat calls for heat. If the boiler isn't firing despite this light being on, the issue usually lies with your external controls or pump rather than the boiler itself.
DIY fix possible
No action required if the boiler is heating correctlyIf the boiler is not firing, check that your room thermostat is turned upEnsure your programmer or timer is set to an 'ON' period
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
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