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flag Electric kettles are clicking due to hard water scale and thermostat movement, experts say.

flag Some electric kettles are making a clicking sound even when not in use, puzzling many users. flag Experts say this sound is likely due to hard water, which forms scale inside the kettle. flag When heated, the scale particles break off, causing a clicking noise as they collide. flag The kettle's bimetallic thermostat, which expands and contracts with temperature changes, may also contribute to the sound.

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