Your boiler is currently attempting to light the flame but is failing to do so, meaning you won't have heating or hot water until it succeeds.

ignition

What causes this fault?

This fault occurs when the boiler tries to light the burner but cannot detect a stable flame after several attempts. The most common reasons are a lack of gas reaching the unit, worn-out spark electrodes that can no longer create a light, or a buildup of debris blocking the ignition process.