Im still a student and in my house i got a goodman 80% furnace.When i set my thermostat to 70ºF the furnace works just fine.If i turn it of for one night the house gets to 65ºF when i turn it back on the furnace turns on normal operation but after a while the burners turn off and the blower motor runs still but then all the sudden the inducer tries to start again because the thermostat is still not satisfy and tries to turn on i change the thermostat already but it didnt make no difference in my opinion i believe my corcuit board is going bad