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How furnace ignitor works

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How furnace ignitor works

A furnace ignitor is a crucial gas furnace component responsible for igniting the gas in the combustion chamber. It is a small device that uses electricity to generate heat and ignite the gas. The ignitor is typically made of silicon carbide or silicon nitride, which is highly resistant to heat and corrosion.
 
When the furnace turns on, the ignitor receives an electrical signal from the control board. This signal causes the ignitor to heat rapidly, reaching up to 2,500 degrees Fahrenheit. As the ignitor heats up, it emits a bright glow, igniting the gas in the combustion chamber.
 
Once the gas is ignited, the furnace’s blower motor kicks in, blowing warm air throughout the house. The ignitor then cools down, and the cycle repeats itself each time the furnace turns on.
 
Keeping the furnace ignitor clean and debris-free is important to ensure proper function. If the ignitor fails to light the gas, a professional HVAC technician may need to replace it.