BoilerFaultCodesTechnical description
Flashes to indicate spark operation (stops after detection).
What causes this fault?
This fault occurs when the boiler's internal computer tries to light the gas but cannot confirm that a steady flame has been established. The most common reasons are that the spark is too weak to ignite the gas, or the sensor that detects the flame has become covered in soot and can no longer 'see' the fire.
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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