BoilerFaultCodesYour boiler has detected an electrical fault within its internal wiring or a control component, causing it to shut down 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: Short circuiting
What causes this fault?
This fault occurs when an electrical current follows an unintended path within the boiler's circuitry, often due to a component failure or damaged insulation. The most common reasons are water leaking onto internal electrical parts or a critical failure within the main control board's surface components.
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 660 — no call-out fees, no surprises.
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