BoilerFaultCodesYour boiler has failed to ignite and has locked itself out as a safety precaution.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Final fault code (Refer to section 7.11)
What causes this fault?
This fault occurs when the boiler tries to light the flame several times but fails to detect one, causing it to shut down for safety. The most common reasons include a blocked gas supply, worn-out spark electrodes that can no longer ignite the gas, or a faulty internal component failing to open the gas valve.
This fault is more common during the first cold snap of winter, when increased demand can highlight underlying issues with the ignition components or external gas supply.
DIY fix possible
Check if your gas supply is turned on and other gas appliances are workingRotate the mode selector switch to the 'Reset' position and wait for 10 secondsReturn the selector switch to the original position and wait for the boiler to restart
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 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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