BoilerFaultCodesTechnical description
No flame after the ignition phase – electrode error, flame unstable, incorrect valve gas offset or flue gas circuit obstructed
What causes this fault?
This fault happens when the boiler's control system cannot confirm that a flame has successfully lit after trying to start. The most common reasons are a worn-out ignition spark or a dirty sensor that fails to 'see' the flame, though it can also be caused by an incorrect mix of gas and air. Because the boiler cannot guarantee it is burning fuel safely, it shuts down as a protective measure.
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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