I WOULD TRY TO BYPASS THE THERMOSTAT TO MAKE SURE THE UNIT WORKS AND REPLACE THE THERMOSTAT IF IT DOES , SEE IF IT IS UNDER WARRENTY, MY GUESS WOULD BE THAT IT IS JUST DEFFECTIVE, AND YOU ARE TRYING TO FIND A CAUSE, THIER IS NO REAL CAUSE THAT I CAN THINK OF THAT WOULD BURN UP THE THERMOSTAT IF IT WAS OR HAS BEEN WORKING, GOOD LUCK
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I WOULD TRY TO BYPASS THE THERMOSTAT TO MAKE SURE THE UNIT WORKS AND REPLACE THE THERMOSTAT IF IT DOES , SEE IF IT IS UNDER WARRENTY, MY GUESS WOULD BE THAT IT IS JUST DEFFECTIVE, AND YOU ARE TRYING TO FIND A CAUSE, THIER IS NO REAL CAUSE THAT I CAN THINK OF THAT WOULD BURN UP THE THERMOSTAT IF IT WAS OR HAS BEEN WORKING, GOOD LUCK