BoilerFaultCodesYour boiler’s main computer brain has developed an internal electrical error and can no longer control the heating system safely.
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 (PCB)
What causes this fault?
This fault occurs when the boiler's main control board suffers a critical internal electrical failure, meaning it can no longer communicate with the sensors or fire the burner safely. The most common reason is age-related wear on the board's circuitry or a small power surge that has damaged a sensitive component. Because the 'brain' of the boiler is compromised, it shuts down entirely to prevent any unpredictable behavior.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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