BoilerFaultCodesYour boiler has failed to ignite properly after several attempts, which usually means the gas supply is interrupted or there is a problem with the ignition system.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: GO TO FRAME 75
What causes this fault?
This fault occurs when the boiler attempts to start up but cannot establish or detect a stable flame. The most common reasons include a temporary interruption in the gas supply, a worn-out ignition spark probe, or a blockage within the internal burner components.
This issue is more frequent during extreme cold snaps, as external gas meters or pipes can occasionally 'freeze' or suffer from pressure drops in the local network.
DIY fix possible
Check that your gas prepayment meter has credit (if applicable).Check that other gas appliances, like a hob, are working to confirm gas is reaching the property.Restart the boiler by pressing the reset button 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 HF — 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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