BoilerFaultCodesYour boiler is trying to start but cannot light the gas to create a flame, meaning you will not have any heating or hot water.
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. Check gas supply, flame sensing electrode, or PCB (Section F)
What causes this fault?
This fault occurs when the boiler fails to detect a flame after several attempts to light. The most common reasons are a lack of gas reaching the burner, a buildup of carbon on the electrodes prevents a spark, or the internal computer failing to recognise that the gas has successfully lit.
This issue is more frequent during the first cold snap of winter, as gas valves can occasionally stick or become sluggish after sitting idle during the summer months.
DIY fix possible
Check if other gas appliances, like a cooker, are working to confirm gas is reaching the propertyEnsure your gas meter has credit if you have a prepayment meterCheck that the gas stop tap is fully openPress the 'Reset' button on the front of the boiler
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 Spark at ignition electrodes neon flashing — 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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