BoilerFaultCodesKeston L2 Fault Code
The Keston L2 fault code means: your boiler has tried to light several times but cannot establish a flame, meaning your heating and hot water will not work until the issue is resolved.. It appears on 2 Keston models in our database.
Technical description: Ignition Lockout
DIY fix possible
Check that your gas prepayment meter has credit (if applicable).Ensure the main gas supply valve is open.Check if other gas appliances in your home, like a hob, are working.Press the 'Reset' button on the boiler control panel.In freezing weather, check if the external condensate pipe is frozen and thaw it with warm water.
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Keston models that show the L2 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Keston L2 fault code information on this page is sourced and cross-checked against the official Keston service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 31 August 2026