BoilerFaultCodesIdeal lockout LED 2 ON Fault Code
Also written as LOCKOUTLED2ON — same fault.
The Ideal lockout LED 2 ON fault code means: your boiler has tried to light several times but cannot detect a flame, causing the system to shut down for safety.. It appears on 1 Ideal model in our database.
Technical description: Ignition Control PCB 41 has attempted 4 ignitions and failed. Flame not detected.
What causes the Ideal lockout LED 2 ON fault?
This fault occurs because the boiler's control system cannot confirm that a flame has successfully lit after several attempts. It is usually caused by a lack of gas reaching the burner, a worn-out ignition spark electrode, or a dirty sensor that can no longer 'see' the flame even if it is there. The boiler shuts down as a safety precaution to prevents unburnt gas from building up inside the unit.
This issue can be more frequent during the first cold snap of winter when components that have been idle all summer are suddenly forced to work under high demand.
DIY fix possible
Check that your gas emergency control valve is in the 'on' positionIf you have a pre-payment meter, ensure you have credit availableCheck if other gas appliances in your home, such as a hob, are working correctlyPress the reset button once to see if the boiler restarts
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Gas Safe Register →Ideal models that show the lockout LED 2 ON fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal lockout LED 2 ON 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