BoilerFaultCodesTechnical description
No ignition – control gas supply line valves could be open
What causes this fault?
This fault occurs when the boiler attempts to start but cannot detect a flame after several attempts. It is usually caused by a lack of gas reaching the burner, a faulty spark plug that cannot ignite the gas, or a sensor that fails to tell the boiler that a flame is present.
This issue can occur in winter if the external gas regulator freezes or if the gas meter is under-delivered during periods of high demand.
Engineer required
This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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