BoilerFaultCodesTechnical description
No flame signal after ignition burner control unit could need replacing
What causes this fault?
This fault occurs when the boiler's internal computer tries to start a fire but cannot detect a stable flame. The most common reasons are a lack of gas reaching the burner, dirty sensors failing to 'see' the flame, or a fault within the electronic control board that manages the ignition process.
This fault can be more frequent during the first cold snap of winter, as gas valves may stick after long periods of inactivity or external gas regulators may be affected by freezing temperatures.
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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