BoilerFaultCodesYour boiler has failed to light because it cannot detect a flame or is struggling to vent correctly.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Check gas supply, check flue system, check polarity
What causes this fault?
This fault occurs when the boiler attempts to start up but fails to sense a flame after several attempts. The most common reasons are a lack of gas reaching the burner, a faulty spark electrode that can't ignite the fuel, or a blockage in the chimney pipe preventing the air flow needed for combustion.
This issue can occur more frequently during a cold snap if the external gas regulator or pipework becomes affected by freezing temperatures, restricting gas flow.
DIY fix possible
Check if other gas appliances in your home, like a cooker, are working.Ensure your gas meter has credit if you use a pre-payment meter.Check outside to ensure the flue pipe is not blocked by debris or ice.Reset the boiler by turning the selector switch to 'OFF/RESET' and then back to 'ON'.
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 10 — 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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