BoilerFaultCodesIdeal L02 Fault Code
The Ideal L02 fault code means: your boiler has failed to light several times and has locked itself for safety, meaning you have no heating or hot water.. It appears on 3 Ideal models in our database.
Technical description: Ignition Lockout
What causes the Ideal L02 fault?
This fault occurs when the boiler attempts to ignite the gas several times but fails to detect a sustained flame. The most common reasons include a lack of gas reaching the burner, a worn-out ignition electrode that can no longer create a spark, or a faulty gas valve preventing the fuel from flowing.
This fault is more frequent during extreme cold spells, as external gas meters or regulators can freeze, or the condensate discharge pipe can become blocked with ice, preventing the boiler from lighting.
DIY fix possible
Check that your gas supply is turned on (check other gas appliances like a hob).If you have a prepay meter, ensure there is sufficient credit.Press and hold the 'Reset' button for 2 seconds to see if the boiler restarts.
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Gas Safe Register →Ideal models that show the L02 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal L02 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