This is my first but not last post. Im helping a fellow HVAC prof. replace and repair units on his industial building. We replaced two failed compressors and he accidentally put his coil wire for a compressor on a 460 terminal. Blowed the fuse on the board then unit would only cycle fan for about 30 seconds and shutdown. Replaced board with a like unit and still same thing. Went through troubleshooting manual with no luck. Unit will not even run through test mode. This is a little over my head but going to Lacrosse in June to get better training. Checked all safeties and unit has economizer. No luck! Any suggestions are appreciated.