BoilerFaultCodesYour boiler's main internal computer has developed a serious fault and is no longer able to communicate with or control the heating system 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 internal computer brain suffers a hardware failure, preventing it from processing information or sending commands to other parts. The most common reason is electrical degradation of the circuit board over time, though it can also be triggered by loose connections or a short circuit 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 E15 — no call-out fees, no surprises.
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