Today I came out due to main level system not working. It’s a carrier furnace located in the attic. Upon arrival the unit had no power. It had power coming in, but no power getting to the board. The reason was a bad transformer. I tested it and got no continuity and ohmed it out and it was dead. I replaced the transformer and let the system run for about 30 minutes and all is good! Mr. Darrell has signed up for the membership plan! Thanks for giving us a call and I look forward to seeing you again! I hope you have a great day!