Your boiler is simply displaying a status code to confirm it is configured to run on Natural Gas; this is not a fault and requires no action.
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: Fuel type: Natural Gas
What causes this fault?
This message appears as a status indicator rather than a mechanical failure. It confirms that the boiler's printed circuit board is correctly configured to burn natural gas as its fuel source. You will typically see this when the boiler is first powered on or during its normal start-up sequence.
DIY fix possible
This fault may be fixable without an engineer. Check your manual first.
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