Your boiler has detected a problem with how it tracks its own flame, causing it to shut down for safety purposes.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Fault in flame monitoring
What causes this fault?
This fault occurs when the boiler's internal computer is unable to verify that a flame is present, even if the burner has ignited correctly. It is usually caused by a dirty or corroded sensor that can no longer send a clear signal back to the control board, or a fault within the wiring and electronics that manage safety checks. Consequently, the boiler shuts down because it cannot confirm it is operating safely.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
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A boiler cover plan would cover faults like 2920 — no call-out fees, no surprises.
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Could it be time for a new boiler?
If repair costs are adding up, a new energy-efficient boiler could be the smarter long-term choice.
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