BoilerFaultCodesYour boiler has tried to light but cannot find a flame, which is often caused by a temporary interruption in your gas supply or a blocked flue.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Gas supply problem; Gas line requires purging; Reversed polarity; Broken, internal flue joint. Appears when the burner has failed to ignite, or the flame supervision system has failed to detect a flame.
What causes this fault?
This fault occurs when the boiler's control system attempts to light the burner but fails to detect a steady flame after several attempts. The most common reasons include a temporary interruption in the gas supply, a dirty ignition electrode that can no longer create a spark, or an issue with the air supply preventing successful combustion.
This issue can be more common during the first cold snap of winter when gas components that have been idle all summer are suddenly put under high demand.
DIY fix possible
Check that your gas emergency control valve is open and you have credit on your gas meter.Verify if other gas appliances in your home, like a hob, are currently working.Press the 'Reset' button on the boiler control panel to attempt a restart.
Find a Gas Safe engineer
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A boiler cover plan would cover faults like 01 — 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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