BoilerFaultCodesYour boiler has failed to light the gas flame and has shut down as a safety precaution.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Flame lockout
What causes this fault?
This fault occurs when the boiler attempts to start up but cannot detect a sustained flame, leading it to shut down for your safety. The most common reasons include a lack of gas reaching the unit, worn-out spark electrodes that can no longer ignite the fuel, or a faulty sensor that fails to 'see' the flame even if it is lit.
This issue can be more frequent during extreme cold spells if the external gas regulator freezes or if damp weather affects the electrical integrity of the ignition leads.
DIY fix possible
Check that your gas supply is turned on and other gas appliances are workingRotate the control knob to the 'OFF/RESET' position and then back to the 'ON' positionWait for the boiler to attempt to restart; if the red light remains, a professional is required
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
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