BoilerFaultCodesYour boiler's internal computer has suffered a critical software or hardware failure and can no longer control 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: Internal control box failure: check/replace the control box.
What causes this fault?
This fault occurs when the boiler's main electronic brain suffers a hardware failure or a corruption of its internal data. It is usually caused by electrical wear over time or a power surge that damages the circuits responsible for managing the boiler's safety sequences.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
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A boiler cover plan would cover faults like E17 — no call-out fees, no surprises.
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