BoilerFaultCodesTechnical description
Flame failed during burner operation. Open the main shut off valve, shut down the appliance and check gas line, replace the ionisation electrode, set burner correctly and minimum rated load, check the integrity flue system and if the interconnected room air supply is too small, or the size of the ventilation opening is too small, clean the heating block on the flue gas side or replace the control unit/burner control unit
What causes this fault?
This fault occurs when the boiler’s sensors lose track of the flame while it is trying to heat your home, causing the system to shut down as a safety precaution. The most common reasons are a worn-out component that detects the fire, a temporary drop in gas pressure, or a blockage within the boiler's internal burner or exhaust system.
This fault can be more frequent during extreme cold spells when high gas demand in the local area causes pressure fluctuations or when internal components are working at their maximum capacity.
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.