BoilerFaultCodesYour boiler has tried to light several times but has failed to detect a flame, meaning your heating and hot water will not work until it is reset or repaired.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Flame not detected
What causes this fault?
This fault occurs when the boiler's control system attempts to start the combustion process but cannot confirm that a stable flame has been established. The most common reasons include a lack of gas reaching the burner, worn-out ignition components that fail to spark, or a dirty sensor that cannot 'see' the flame even if it is lit.
This fault is frequent during extreme cold snaps, as the external condensate pipe can freeze and back up into the boiler, preventing it from lighting.
DIY fix possible
Check that your gas supply is turned on at the meterCheck that other gas appliances, like a hob, are working correctlyPress and hold the 'Reset' button for three seconds
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Protect yourself from future repair bills
A boiler cover plan would cover faults like EA — no call-out fees, no surprises.
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Parts for discontinued models can be hard to find and expensive. A new A-rated boiler could save you money on both repairs and energy bills.
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