BoilerFaultCodesTechnical description
No ignition or gas supply failure
What causes this fault?
This fault occurs when the boiler's control system attempts to light the burner but fails to detect a flame after several attempts. The most common reasons are a lack of gas reaching the appliance, a worn ignition spark electrode that cannot create a flame, or a faulty gas valve that isn't opening correctly.
This fault is more common in winter, as freezing temperatures can block external gas regulators or cause condensate pipes to freeze, both of which prevent the boiler from lighting.
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.
Find a Gas Safe engineer
Search the official register →