BoilerFaultCodesYour boiler's main internal computer has developed a serious fault and is no longer able to manage the heating process 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 central control board suffers a hardware failure and can no longer process data or send signals to other components. The most common reasons for this are electrical surges, moisture ingress, or simply the natural degradation of the solder joints and capacitors over time as the unit ages.
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 17 — no call-out fees, no surprises.
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