I too have checked the power to the door switch, OK, but the 3 amp fuse was blown. Replaced the fuse and tried the furnace again and the fuse immediately blew. The led on the board is out and won't come on even after replacing the fuse, Transformer has 120 in 24 out. Can you give me a direction where to look? I'm thinking its got a blown capacitor somewhere but I don't know where

I finally broke down and bought a new control board, everything works fine now.