BoilerFaultCodesTechnical description
Refer to fault finding section on Page 30 (displayed when control fails to detect flame after ignition attempts).
What causes this fault?
This fault occurs when the boiler tries to start but can’t establish a steady flame to begin heating. It is usually caused by a worn-out ignition part not creating a spark or a gas valve that isn't opening properly to let fuel into the burner. Over time, soot or wear on the internal sensors can also prevent the boiler from 'seeing' the flame even if it has lit.
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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