Technical description
Ignition fault or no gas supply
What causes this fault?
This fault occurs when the boiler attempts to start but fails to detect a flame after several attempts. The most common reason is a temporary interruption in the gas supply or a build-up of carbon and wear on the components that generate the ignition spark.
This fault is slightly more common during the first cold snap of autumn when internal components that have been idle all summer are suddenly forced to work 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.