BoilerFaultCodesYour boiler's internal computer has encountered a critical 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: Control box failure
What causes this fault?
This fault occurs when the boiler's main electronic brain suffers an internal hardware failure, preventing it from processing instructions. It is usually caused by electrical wear and tear over time or a communication breakdown between the internal circuit boards. Because the boiler can no longer monitor safety sensors or manage the flame, it shuts down completely to prevent damage.
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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