BoilerFaultCodesYour boiler is receiving power from the mains electricity and is currently in its normal standby mode.
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 actually a fault, but rather a status indicator showing that your boiler is connected to a live electrical supply. It confirms that the internal control board is receiving power and the unit is waiting for a signal from your thermostat to begin the heating process. If your radiators aren't getting warm while this is displayed, the issue usually lies with your external controls or a lack of demand for heat.
DIY fix possible
Check if the room thermostat is turned upEnsure the programmer is set to 'On' or 'Auto'Check that the gas supply is open
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 Neon I3 — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Ideal Classic SE9 RS 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.
Affiliate links — we may earn a commission at no extra cost to you.