Furnace precision tune up; clean and tune up furnace; clean burners, test ignition components, adjust gas level, test safety circuit, check indoor motors, checked all electrical components, tested indoor air flow, checked heating temperatures, and tested overall furnace operation. Found the furnace would go through the entire cycle of operation but the igniter failed to light up. This causes the furnace to stop operating. Replaced igniter and tested operation of the system. Found no other major issues at this time. With age replacement is recommended soon. Will follow up with pricing on a steam humidifier.