I installed a new Comfort-Aire gas furnace in my sisters house today. After getting everything hooked up. I turned the thermostat up to start the furnance. The inducer moter ran for about 10 sec and we heard a pop come from the area of the control board and everything stopped. We inspected the control board for any signs of visible damage (burns) but did not see any. After checking for power to the board and to the transformer everything checked out OK. When we checked for power from the transformer there was none. All of the wiring was doubled checked and all was OK. The thermostat that is in the house is a Hunter. I know of Honywell and White-Rodger thermostats but did not know that Hunter made a heating/cooling thermostat. My question is, could the thermostat have caused the problem?