BoilerFaultCodesTechnical description
Flame drop out – check for obstruction of the flue and/or air terminals, blockage/freezing of the drain pipe or a low gas supply (LPG).
What causes this fault?
This fault occurs when the boiler's internal computer detects that the flame has unexpectedly gone out during operation. The most common reason is that waste water cannot escape the unit due to a blockage in the drainage pipe, which causes the system to flood and extinguish the burner. It can also be caused by a lack of fresh air reaching the boiler or an unstable gas supply preventing a consistent flame.
This fault is specifically common during freezing winter temperatures, as the external condensate drainage pipe is prone to icing up and backing up the system.
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.