Low
Neon SG1 on Ideal Classic HE

Your boiler is currently trying to light the flame and this light will go off once the burner has started successfully.

Monitor it

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.

What the manual says

Manufacturer manual

Flashes to indicate ignition operation (stops after detection).

From this model's manual
Verified against the Ideal Classic He installation & service manual.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

What causes this fault?

This status occurs while the boiler is trying to create a flame to start the heating process. It is triggered when the control board sends power to the ignition system to spark the burner. If this light continues to flash without the boiler firing up, it usually means the fuel is not reaching the burner or the spark is not strong enough to light the gas.

This can be more frequent during the first cold snap of autumn, as gas valves or electrodes may struggle to operate correctly after being idle throughout the summer.

DIY fix possible

Monitor the light to ensure it stops flashing once the boiler fires upNo action is required as this is normal operational feedbackIf the light continues to flash without the boiler lighting, try resetting the boiler

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