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Our sauna heater use three phase limit temperature protect thermosatat,
it will have DOUBLE PROTECT FUNCTION, if has limit temp protect function,
if thermostat is broken, limit temp with a little higher, for example if you set temp is 50°C,
when the room temperature arraive at 50°C, heater will stop working, but this time this stop functionis broken,
and temperature will continue increasing, when temperature arrive at 55°C,
sauna heater will stop heating. it is limit temp protect function.