BoilerFaultCodesKeston L2 Fault Code
The Keston L2 fault code means: your boiler is failing to keep a flame lit, which means the system has shut itself down for safety and you will not have any heating or hot water.. It appears on 3 Keston models in our database.
Technical description: Ignition Lockout
DIY fix possible
Check if other gas appliances in your home (like a hob) are working to ensure gas is reaching the property.Ensure your gas meter has credit if you have a prepaid meter.Check if the white plastic condensate pipe leading outside has frozen during cold weather and thaw it with warm water.Press the 'Reset' button on the front of the boiler for five seconds.
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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 7 July 2026