BoilerFaultCodesTechnical description
Flame simulation
What causes this fault?
This fault occurs when the boiler's control system detects an electrical signal suggesting a flame is present even though the gas valve is closed. The most common reason is a faulty sensing electrode that is sending a 'ghost' signal, or moisture and debris on the ignition lead causing a short circuit. Because the boiler believes it is unsafe to ignite while it thinks a flame already exists, it shuts down as a safety precaution.
This fault can be more frequent during periods of high humidity or heavy rain, as moisture entering the casing can interfere with the sensitive electrical components that monitor the flame.
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.