BoilerFaultCodesYour boiler's internal computer has detected a communication error or a hardware failure within its own electronic control system.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Internal fault
What causes this fault?
This fault occurs when the boiler's main control board suffers a hardware failure or a breakdown in its internal communication lines. It is essentially a software crash or an electronic malfunction that prevents the boiler from safely processing instructions. The most common reason is age-related component fatigue on the circuit board or a loose connection in the internal wiring harness.
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 E33 — no call-out fees, no surprises.
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