BoilerFaultCodesTechnical description
Pilot fails to light - Piezo unit not working.
What causes this fault?
This fault occurs when the manual ignition system fails to create a spark or provide enough gas to establish the initial pilot flame. It is usually caused by a faulty spark generator, a cracked electrode, or a tiny blockage in the pilot jet that prevents gas from reaching the ignition point. Without this small flame being present and detected, the boiler cannot safely fire up the main burner.
This issue is frequently seen after a long summer break when the boiler has been turned off, as debris or spiders can block the small pilot injector during periods of inactivity.
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.