BoilerFaultCodesYour boiler has tried to light but cannot detect a flame, which means it has locked itself out 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: Ignition failure (flame not sensed)
What causes this fault?
This fault occurs when the boiler fails to light successfully after several attempts, causing the system to shut down for your safety. The most common reason is that the electrodes are worn out and can no longer produce a spark or detect the heat from the flame, though it can also be caused by a lack of gas reaching the unit.
This fault is more common during the first cold snap of autumn when a boiler that has been idle all summer is suddenly forced to work at full capacity, often exposing worn-out ignition components.
DIY fix possible
Check if other gas appliances (like a hob) are working to confirm gas supplyEnsure your gas meter has credit if you use a pre-payment meterPress and hold the Reset button/turn the selector switch to 'R' for five 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 80° neon flashing — no call-out fees, no surprises.
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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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