Your boiler is currently trying to light the burner and you are seeing the normal indicator for the ignition spark.
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: Flashes to indicate spark operation (stops after detection).
What causes this fault?
This indicator appears when the control board sends an electrical current to the ignition electrode to create a spark. It is a normal part of the starting process where the boiler attempts to light the gas to begin heating your home. If the light continues to flash without the boiler firing up, it usually means the spark is occurring but the gas is failing to ignite or the system cannot 'see' the flame.
DIY fix possible
Check if the gas supply is turned on at the meterEnsure there is credit on your gas meterPress the reset button if the light continues to flash without the boiler firing up
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