BoilerFaultCodesYour boiler is struggling to keep its flame lit and has safely shut down after repeatedly failing to stay on.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Loss of flame detected 5 times in 24 hours (with burner on).
What causes this fault?
This fault occurs when the boiler’s control system detects that the flame has gone out unexpectedly five times within a 24-hour period. It is usually caused by a component failing to accurately sense the flame, a blockage in the drainage system, or an inconsistent flow of gas prevented the burner from staying lit.
This fault is more frequent during freezing winter spells, as a frozen external condensate pipe can cause water to back up into the boiler and extinguish the flame.
DIY fix possible
Check that your gas emergency control valve is open and any pre-paid gas meter has credit.Verify if other gas appliances, like a hob, are working to rule out a wider gas supply issue.Restart the boiler by turning the selector switch to the 'Reset' position 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 E.01 – .04 — 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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