BoilerFaultCodesYour boiler is struggling to keep its flame lit, which means the system has safely shut down to prevent issues.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Flame Loss
What causes this fault?
This fault occurs when the boiler successfully lights but the internal sensors cannot confirm a steady flame is present, causing the system to shut down for safety. It is often caused by a worn-out component that monitors the burning gas or an inconsistent supply of fuel and air reaching the burner.
This issue can become more frequent during extreme cold spells if the external gas regulator or pipework is affected by freezing temperatures, restricting the flow of gas.
DIY fix possible
Check that your gas credit hasn't run out if you have a prepayment meterEnsure other gas appliances like your hob are working to confirm your gas supply is activeCheck that the white plastic condensate pipe outside hasn't frozen in cold weatherPress the 'Reset' button on the boiler display
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 4.6 — 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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