BoilerFaultCodesTechnical description
Burner Lockout. Possible causes: gas supply issue, spark electrode/lead failure, gas valve failure, flame sense electrode/cable failure, or control board fault.
What causes this fault?
This fault occurs when the boiler tries to light the burner but fails to detect a stable flame after several attempts. The most common reasons are a lack of gas reaching the unit, worn-out spark components that can no longer create a flame, or a sensor that is too dirty to 'see' the flame once it has started.
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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