If the rest of the hotplate elements are working correctly and you are performing the same tests with all of them then you have a problem. We know that the hotplate works. When hotplates are faulty they don't turn on and off, they just don't work. This would generally be a hotplate controller problem. It sounds as if the controller is faulty and requires replacing. If you are handy you can switch the suspect hotplate controller with a good one and see what happens. This will confirm our suspicions.
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