BoilerFaultCodesYour boiler has stopped working because it cannot keep the flame lit, which means it will no longer provide heating or hot water until reset or repaired.
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's control board detects that the flame has gone out unexpectedly or cannot stay lit after starting. The most common reasons include a buildup of carbon on the ignition probes, a blockage in the drainage system, or an inconsistent flow of gas to the burner.
This fault is more common during freezing winter temperatures, 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 prepayment meter has credit (if applicable)Check that other gas appliances, like a cooker, are working to ensure gas supplyPress and hold the 'Mode' dial to the Reset position for 2 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 L2 — 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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