BoilerFaultCodesTechnical description
Lack of gas, a fault with the ignition or flue – may need to adjust the gas valve or replace a defective electrode lead.
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 reasons are a temporary interruption in the gas supply, a build-up of carbon on the ignition probes, or a component failure that prevents the spark from starting the combustion process.
This issue can occur more frequently during extreme cold snaps if the external gas meter regulator freezes or if the gas supply pressure drops due to high local 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.