My Trane XE 80 gas furnace started behaving incorrectly. When I first turn on the heat in the morning, the furnace fan doesn't blow and eventually the furnace thermal protection kicks in and turns the gas off. After it cools down for a few minutes, it tries again. After 3 or 4 cycles the fan starts blowing and everything works as expected. Do I need to replace the control board?
Another strange thing it did yesterday - it turned on the AC compressor and the condensor was completely frozen in ice. I had the thermostat set to heat and not cool so the compressor should have never been on.