Furnace ignitors, also known as hot surface ignitors, are essential components that ignite the fuel in your furnace or boiler, transforming it into heat. These ignitors light the burner, producing warmth through the heat exchanger. If your furnace is cycling on and off frequently, a faulty ignitor could be the reason behind this short cycling. Save money and reduce technician visits by choosing easy-to-install hot surface and furnace ignitor products designed to extend ignitor life.