BoilerFaultCodesYour boiler is failing to keep its flame lit, which means it cannot heat your home or water.
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 a flame but then loses the signal needed to keep it running. The most common reason is that the internal sensors are dirty or worn out and can no longer 'see' the flame, or the gas valve is failing to maintain a steady flow of fuel.
This fault can be more frequent during hardware-straining cold snaps, particularly if a partially blocked condensate pipe causes the combustion chamber to flood and extinguish the flame.
DIY fix possible
Check if other gas appliances in your home, like a hob, are working correctlyEnsure your gas meter has credit if you use a pre-payment meterRestart the boiler by pressing the 'Reset' button
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 4.5 — 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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