Performed clean and check on gas furnace and humidifier. Conducted combustion analysis, measured temperature rise, tested all electrical components, inspected gas supply, burner, inducer and blower assemblies. Cleaned flame sensor and condensate trap, checked drains and filter. Found and repaired leak at condensate drain. Filter does not need changed at this time. Tested humidifier and changed water panel. Tested humistat and t-stat operations. Found burn damage on control board causing HSI to remain on during entire heat cycle. Will have to reschedule repair. 11-21-19 Returned and replaced control board. Cycled system in heat. Everything is operating within specifications at this time.