BoilerFaultCodesIdeal RED lockout led Fault Code
Also written as REDLOCKOUTLED — same fault.
The Ideal RED lockout led fault code means: your boiler has failed to ignite and has locked itself out for safety, meaning you will not have any heating or hot water until it is reset.. It appears on 2 Ideal models in our database.
Technical description: The boiler does not light after 10 seconds. Press the reset button and the boiler will repeat its ignition sequence.
What causes the Ideal RED lockout led fault?
This fault occurs when the boiler tries to light the burner but fails to detect a flame within its 10-second safety window. The most common reasons are a lack of gas reaching the unit, a worn-out ignition spark, or a component failure that prevents the internal parts from communicating correctly.
This fault is more common during the first cold snap of winter, when increased demand can highlight failing components or when external gas regulators are prone to sticking.
DIY fix possible
Check if other gas appliances in your home (like a hob) are working to ensure gas is being supplied.Ensure your credit meter has sufficient balance if you have a prepay system.Turn the control knob to the 'Reset' position, wait five seconds, then turn it back to the 'On' position.
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Gas Safe Register →Ideal models that show the RED lockout led fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal RED lockout led 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 27 April 2026