So I have furnace that has finally beat me. Its a Goodman 80% about 5 yr old. The problem came to me after another company had replaced the board and by-passed the on/off switch on the unit. The actual problem is that the furnace will begin running the inducer and shut down as if the power was shutting on and off. I had suspicion right away that the blower door switch was bad cause it was stuck closed and didnt open when I removed the door. I bypassed the switch and the problem still happened. I kept checking voltage to the unit while it was acting up. I never saw a voltage drop. I bypassed the thermostat and the problem kept coming. I also kept checking the transformer to see if it was acting up and never lost the 24v. If anyone can offer a suggestion to this issue it would be greatly appreciated. This problem is intermittent.