I bought a foreclosed house that had 3 furnaces (each for one level of the house) and two humidifiers (one for first floor and the other for the second floor). But the former owner took the furnace for the basement and the humidifier for the second floor). I had a furnace guy installed a new humidifier for the second level and a new furnace for the basement. After his work done, my second floor furnace stopped working. I had him back to check it. He saw that the fuse on the furnace board blown. He put a new fuse in, it dead again right when he start the furnace. I think that this furnace guy doesn’t know what he was doing and that he missed up the wiring of my second floor furnace. Instead of having him to mess up more, I’m trying to learn it and fix it myself. How do I correct the wiring on the furnace? Where to buy more fuses? The furnace is Goodman. The humidifier for the second floor works, but the furnace, AC, and fan for the second floor stopped working (they were working before that guy came).