BoilerFaultCodesTechnical description
A flame failure device is incorporated into the control system... should the flame fail for any reason, or should ignition fail to initiate a satisfactory start, the boiler is automatically locked out for safety.
What causes this fault?
This fault occurs when the boiler's internal computer can no longer detect a stable flame during the ignition process. The most common reasons are worn-out sparks that fail to light the gas, a dirty sensor that can't 'see' the flame, or an inconsistent gas supply preventing a steady fire from forming.
This fault is more common during the first cold snap of winter, as internal components like the gas valve can seize up after being inactive during the summer months.
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.