A Furnace Hot Surface Ignitor (silicon nitride or carbide ignitor) is used to ignite the gas used for heat in most modern furnaces by forcing 120 volts through an exposed electrically resistant material. Though it sounds like a very durable component, it is in fact very fragile and must not be bent nor exposed to the oils on your skin.
Fortunately, to diagnose a faulty hot surface ignitor is rather easy. Pay attention to the "tick" sound after the fan come on when you turn on your furnace. The "tick" sound is the gas valve opening and the flame should then start to ignite. The absence of fire, most of the time, means your hot surface ignitor is damaged.
Replacing your furnace's hot surface ignitor is as easy as to diagnose it. There is no need to pay a hefty amount to a technician, all you need is the perfect part for your unit. If you are not sure which hot surface ignitor to get, please do not hesitate to contact us for assistance to get your furnace up and running again.