BoilerFaultCodesTechnical description
Safety error for frequently loss of flame with max correction during the ignition during Calibration Function.
What causes this fault?
This fault occurs when the boiler's internal computer tries to adjust the gas and air mix to create a steady flame, but the flame keeps flickering or blowing out. The most common reason is that the sensing probe has become dirty or worn out, meaning the boiler can no longer 'see' the flame even if it is actually lit. It can also be caused by a faulty gas valve or an unstable gas supply that prevents the boiler from completing its automatic calibration.
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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