BoilerFaultCodesYour boiler's internal computer brain has developed an electrical fault and can no longer control the heating 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 failure - electronic
What causes this fault?
This fault occurs when the boiler's control center suffers a critical communication failure between its components. It is most commonly caused by wear and tear on the electrical circuitry or a sudden power surge that has damaged the sensitive microprocessors inside the unit.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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A boiler cover plan would cover faults like 417 — no call-out fees, no surprises.
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