BoilerFaultCodesTechnical description
Gas supply problem; Gas line requires purging; Reversed polarity; Broken, internal flue joint. Appears when the burner has failed to ignite, or the flame supervision system has failed to detect a flame.
What causes this fault?
This fault occurs when the boiler's control system attempts to light the burner but fails to detect a steady flame after several attempts. The most common reasons include a temporary interruption in the gas supply, a dirty ignition electrode that can no longer create a spark, or an issue with the air supply preventing successful combustion.
This issue can be more common during the first cold snap of winter when gas components that have been idle all summer are suddenly put under high demand.
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.