BoilerFaultCodesYour boiler is failing to light or keep a flame going, which means your heating and hot water have stopped working.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Burner failure
What causes this fault?
This fault occurs when the boiler's control system attempts to start the burner but fails to detect a stable flame. The most common reasons are worn-out ignition components that can't create a spark or a faulty sensor that cannot 'see' the flame even if it is actually lit.
DIY fix possible
Check if other gas appliances in your home, like a hob, are working to ensure gas supply is active.Check that your prepaid gas meter has credit, if applicable.Press the reset button on the control panel to see if the boiler restarts.
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 12-13 — no call-out fees, no surprises.
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Remeha Gas 350 is discontinued — time for a new one?
Parts for discontinued models can be hard to find and expensive. A new A-rated boiler could save you money on both repairs and energy bills.
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