BoilerFaultCodesTechnical description
Ignition failure – try bleeding your radiators
What causes this fault?
This fault occurs when the boiler tries to light the flame but fails to detect one, causing the system to shut down for safety. The most common reason is that the spark isn't strong enough to ignite the gas, or the sensor that monitors the flame has become dirty or worn out. It can also be triggered if air is trapped in the system, which disturbs the internal pressure and prevents the boiler from operating correctly.
This fault often appears after the summer break when the boiler is switched back on for the first time or after the system has been drained for radiator maintenance.
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.