My house was 60 degrees the thermostat said heat was on but we had no air blowing. I turned the furnace off and on and it fired up. In a couple of minutes I had heat but now the thermostat is blank. After 5 minutes or so The heat turned off and the thermostat came back on and said the heat was on. It keeps cycling like this over and over. It's a carrier gas forced air w/ honeywell thermostat.