Performed annual 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. Ignition system is failing. Electronic ignition is out of manufacture range. This means part is starting to crack and losing connection. This will make it very prone to failure and furnace to not operate if it fails. Main flame safety is well below manufacture tolerance. This will also cause furnace not to operate if failed. Recommend humidifier clean and tune up. All recommendations were declined at this visit. I will attach quote for recommended repairs.