BoilerFaultCodesYour boiler has failed to ignite properly, meaning it cannot create a flame to provide 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: Last fault
What causes this fault?
This fault occurs when the boiler attempts to light several times but fails to detect a stable flame. The most common reasons include a lack of gas reaching the burner, contaminated ignition electrodes that can no longer create a spark, or a faulty gas valve preventing the fuel from flowing correctly.
This fault is more frequent during extreme cold snaps, as the internal components work harder and any moisture in the external gas meter or pipework can freeze, restricting the gas supply.
DIY fix possible
Check if other gas appliances, like a hob, are working to ensure gas supply is active.Inspect the condensate pipe outside for signs of freezing if the weather is very cold.Press the 'Reset' button on the boiler control panel for five 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 6.A — no call-out fees, no surprises.
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Could it be time for a new boiler?
If repair costs are adding up, a new energy-efficient boiler could be the smarter long-term choice.
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