System Components
Ignitor
The component in modern gas furnaces that electrically heats up to ignite the gas burner, replacing the older standing pilot light.
What Is a Ignitor?
Modern furnaces use one of two electronic ignition methods: hot surface ignitors (HSI) that glow red-hot to light the gas, or spark ignitors that create an electric spark. Hot surface ignitors are more common in residential furnaces. They're typically made of silicon carbide or silicon nitride and are relatively fragile. When the thermostat calls for heat, the ignitor heats up for 30-60 seconds, then the gas valve opens, the gas ignites, and heat production begins.
Why It Matters for Your Home
A failed ignitor is one of the most common furnace repair calls. If your furnace starts its cycle but never lights, you'll hear the blower and maybe some clicking, but no heat. Ignitors are wear items that typically last 3-7 years and are relatively inexpensive to replace. However, frequent ignitor failure can indicate other problems like short cycling or gas pressure issues that a thorough technician should investigate.
Furnace not lighting? Call Trademark Tek at 541-500-0663 for fast, expert repair.
Quick Facts
Category
System Components
Also Known As
Ignitor
