BoilerFaultCodesIdeal Neon SG1 Fault Code
Also written as NEONSG1 — same fault.
The Ideal Neon SG1 fault code means: your boiler is currently trying to light the flame, which is a normal part of its startup sequence.. It appears on 8 Ideal models in our database.
Technical description: Flashes to indicate ignition operation (stops after detection).
What causes the Ideal Neon SG1 fault?
This status occurs when the boiler sends an electrical spark to the burner to ignite the gas and start the heating process. If the light continues to flash without the boiler firing up, it usually means the system is struggling to sense a flame or the gas is not reaching the burner correctly. While it is often just a normal part of the startup sequence, a persistent flash suggests a component like the ignition lead or gas valve is failing.
DIY fix possible
Observe the light to see if it stops flashing and stays on (solid) or turns off once the boiler is runningCheck if the gas supply is turned on if the boiler fails to light after several attemptsPress the reset button if the light continues to flash without the boiler firing up
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Ideal models that show the Neon SG1 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal Neon SG1 fault code information on this page is sourced and cross-checked against the official Ideal service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026