BoilerFaultCodesYour boiler's computer brain has suffered a serious electronic failure 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 control box failure: check/replace the control box.
What causes this fault?
This fault occurs when the boiler's internal computer suffers a critical memory or communication error that prevents it from managing the gas valve and sensors. It is usually caused by electrical components on the circuit board wearing out over time or being damaged by a sudden power surge. Because the 'brain' can no longer guarantee the boiler is operating safely, the system shuts down entirely as a protective measure.
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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