BoilerFaultCodesYour boiler has tried to light but either failed to start or cannot detect that a flame is present, often due to a lack of gas or a drainage issue.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Illuminates in the event of the burner failing to light, when incomplete lighting of the burner occurs or blockage of the condensate drain.
What causes this fault?
This fault occurs when the control board fails to detect a stable flame after several attempts to ignite the burner. The most common reasons are a temporary interruption in the gas supply, a build-up of carbon on the internal sensors, or a blockage in the drainage pipe that prevents waste water from leaving the unit.
This issue is particularly common during freezing winter temperatures, as the external condensate pipe can freeze solid and cause the boiler to shut down for safety.
DIY fix possible
Check that your gas meter has credit and that the gas emergency control valve is open.Turn the selector switch to the 'Reset' position, hold for five seconds, then turn it back to the 'On' position.Check that the external condensate pipe is not frozen if it is winter.
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