I have a goodman furnace I have replaced the flame sensor the heat exchanger was also replaced and still having the same problems it acts like to wants to start but will not start the blower will start but the flame sensor will not start up please help.

You need to see if you get power to the ignitor if not check all reset limit switches to see if there tripped also make sure your vent is not plugged if that's all OK you might need a new board in which case you might want to call your dealer before replacing as electrical parts are usually not returnable