So as not to assume anything, you let the hot water faucet run until there was a steady stream of cold water before you turned on switch. If you have a meter, measure the voltage across the two terminals with the switch on. ( be careful if the switch works there is 110V there.You are sure the pop buttons are not popped out, It does not make any difference which wire goes to which terminal. It is just a resistive heating element. The breaker almost always trips when the element burns out, so just for giggles, turn it off and then back on to insure it is reset.
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