Our furnace is only blowing cold air and the blower will not shut off with the thermostat. The indicator light flashes 2 times-and the code thing says it means system lockout -check line clarity.:confused: The ignitors try to light but go out right away. Now it is flashing constantly meaning internal control failure replace?? Help it is very cold Model Number-HA02230D175B160567 ---American Standard Freedom 80