BoilerFaultCodesTechnical description
The description indicates this is displayed when there is a failure in the flame safety device, specifically if the main burner is extinguished or the gas inlet cock is turned off.
What causes this fault?
This fault occurs when the boiler's control system fails to confirm that a flame has been successfully lit after a sequence of attempts. The most common reasons include a lack of gas reaching the burner, worn-out sparking electrodes that fail to ignite the fuel, or a dirty sensor that can no longer 'see' the flame even if it is actually present.
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 →