BoilerFaultCodesYour boiler has detected an internal error within its main electronic brain, causing it to stop running for safety.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Internal fault in burner controller.
What causes this fault?
This fault occurs when the boiler's main control board fails its internal safety self-checks, essentially meaning the 'brain' of the unit has developed a communication error or hardware failure. It is usually caused by a component failure on the circuit board itself or, more rarely, by an electrical surge that has damaged the delicate sensors.
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 F009 — 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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