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You can often remove the base of a cordless jug kettle by removing several screws in the bottom, though you may need a security screwdriver bit. This will allow you to check the element with a test meter and inspect the switch mechanism. Unfortunately the element is not usually replaceable, and faults with the switch may be due to a small broken plastic part, not amenable to repair. Water leaks, also can be hard to fix. However, this is by no means always the case, and it's always worth checking to see whether, in fact, it's a simple repair.