Technical description
Ignition fault
What causes this fault?
This fault occurs when the boiler's control system attempts to light the burner but fails to detect a stable flame after several attempts. It is often caused by worn-out ignition sparks that can no longer bridge the gap, a faulty gas valve preventing fuel from entering the burner, or a problem with the internal electronics that monitor the flame.
This fault is more common during the first cold snap of autumn when internal components that have been idle over summer fail to operate correctly upon restart.
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.