BoilerFaultCodesYour boiler has detected an electrical connection issue or an internal fault in its main control computer, causing it to stop working for safety.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Control unit or earth fault. Mains supply not correctly earthed. Control unit faulty.
What causes this fault?
This fault occurs when the boiler's main control board loses its vital electrical grounding connection or suffers an internal hardware failure. It is often triggered by loose wiring between components or a power surge that has damaged the delicate circuitry inside the control unit.
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 e3 — no call-out fees, no surprises.
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