BoilerFaultCodesYour boiler has started to light but the flame has gone out, which means the system has stopped providing heating and hot water for safety.
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 ignites but cannot sustain or detect the flame, causing the system to shut down for safety. The most common reasons include a carbon-coated sensing probe that can no longer 'see' the fire, or an inconsistent gas supply preventing a steady flame.
This fault can be more frequent during extreme cold spells if the external gas regulator freezes or if moisture in the gas line restricts flow.
DIY fix possible
Check if other gas appliances, like a hob, are working to ensure gas is reaching the property.Check that your gas pre-payment meter (if you have one) has credit.Restart the boiler by pressing the 'RESET' button firmly for two 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 F2 — 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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