BoilerFaultCodesYour boiler has experienced a lockout due to a failure to ignite or a flame being lost during operation.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Re-set as described for code 01.
What causes this fault?
This fault happens because the boiler has tried to light the burner but failed to detect a steady flame after several attempts. It is usually caused by a lack of gas reaching the burner, a worn-out ignition spark, or a sensor that can no longer 'see' the flame even if it is there.
This issue is more frequent during extreme cold snaps, as external gas meters or pipes can sometimes become restricted by freezing temperatures.
DIY fix possible
Locate the mode selector switch on the front panel.Turn the switch to the 'OFF/RESET' position and wait for a few seconds.Turn the switch back to either 'Hot Water' or 'Heating and Hot Water' mode to restart the boiler.
Find a Gas Safe engineer
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A boiler cover plan would cover faults like 05 — 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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