BoilerFaultCodesYour boiler has started to light but the flame has gone out unexpectedly, meaning the system has shut down 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 maintain a steady flame, causing it to shut down for safety. The most common reasons are a dirty or worn-out sensor that can no longer 'see' the flame, or an inconsistent gas supply preventing a stable burn. In some cases, it can also be caused by internal components like the spark electrode or the control board failing to process the flame signal.
DIY fix possible
Check that your gas stopcock is open and you have credit on your gas meterCheck if other gas appliances like your hob are working correctlyPress the 'Reset' button on the front of 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 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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