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High limit switches have a reset button that
pops out when tripped. This opens the switch allowing no path. If
the button is not popped out you should have continuity through the
poles of the high limit.
The primary job of the High Limit Switch in the
finished product is to prevent scalding water from ever reaching the
people using the product. Sure, the thermostat should shut the
heater off long before the point at which the High Limit Switch is
needed, but thermostats, like everything else, fail. | 
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