Performed no heat diagnostic for 2 systems Upstairs- failed capacitor, dirty blower, failed control board, loose wiring harness, improper gas connections, no te flood protection, failed pressure switch, unit is 20 years old Main- failed gas valve, improper gas connections. Dirty blower, failed capacitor, failed board, failed pressure switch, no te flood protection, need maintenance done. Unit is 20 years old Due to age of system and cost of repairs would recommend replacement over repairs. Based on our findings today, it might be time to think about getting a brand new system.