Perform one system diagnostic for no heat on main level unit. Found blown fuse, failed ECM blower motor, transformer, overheating, dirty filter, dirty blower wheel, dirty condenser coil, failed dual run capacitor, also found rusting in all burners in heat exchanger, possible holes forming, no TE flood protection. Due to age of system, nature of failures, and cost of repairs. Would recommend getting quote for new system. Also would recommend adding indoor air quality upgrades to unit. System is not operational at this time. Based on our findings today, it might be time to think about getting a brand new system.