BoilerFaultCodesYour boiler has failed an internal computer self-test and has stopped working as a safety precaution.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Internal check
What causes this fault?
This fault occurs when the boiler's internal computer performs a safety self-check and detects a mismatch or failure in its own electronic logic. The most common reason is a hardware malfunction within the main control board or a communication error caused by damaged internal wiring.
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 5 — no call-out fees, no surprises.
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