BoilerFaultCodesTechnical description
Flame detected when no flame should be present
What causes this fault?
This fault occurs when the boiler's internal sensors detect a flame signal at a point in the starting sequence where the gas should still be turned off. The most common reason is a faulty sensing electrode sending a false signal or a gas valve that is leaking slightly and allowing fuel through when it shouldn't. In some cases, a fault on the main circuit board can lead the boiler to misinterpret electrical signals as a live 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.
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