BoilerFaultCodesYour boiler has failed to light or stay lit, which is often caused by a blocked condensate pipe or a sensor detecting a problem with the ignition process.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Ignition failure/not flame sensed, condense sensor activated
What causes this fault?
This fault occurs when the boiler tries to ignite but fails to establish a steady flame, or if the safety sensors detect that the waste water cannot drain away properly. The most common reason is a blockage in the condensate trap or external pipework, which causes water to back up into the heat exchanger and extinguish the burner. It can also be triggered by worn ignition components that can no longer create a strong enough spark to light the gas.
This fault is frequently seen during freezing winter spells, as the external condensate pipe can freeze solid and cause the boiler to shut down for safety.
DIY fix possible
Locate the external plastic condensate pipe and check if it has frozen in cold weather.If frozen, carefully pour warm (not boiling) water over the pipe to melt the ice.Restart the boiler by turning the mode selector switch to 'Reset' and then back to the original position.
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