Furnace Igniter Replacement Guide: Silicon Nitride vs. Silicon Carbide

Furnace Igniter Replacement Guide: Silicon Nitride vs. Silicon Carbide

The hot surface igniter is the component that lights your furnace burners. When it fails, your furnace goes through its startup sequence but never produces heat. It's one of the most common furnace repairs — and one of the simplest. Here's what Minnesota homeowners need to know.

How Hot Surface Igniters Work

When your thermostat calls for heat, the furnace control board sends electricity to the igniter. The igniter heats to approximately 1,800-2,500°F — hot enough to ignite natural gas flowing from the burners. The igniter glows orange for 30-60 seconds before the gas valve opens. Once the flame sensor confirms ignition, the furnace enters its normal heating cycle.

Silicon Carbide vs. Silicon Nitride

Modern Goodman furnaces use silicon nitride igniters — a significant reliability improvement. In Minnesota, where your furnace may cycle 15,000-20,000 times per season, the longer-lasting silicon nitride means fewer failures.

Signs of Igniter Failure

• Furnace cycles but never lights: Inducer runs, igniter glows (or doesn't), burners never ignite
• Igniter glows but dims quickly: Cracked igniter can't maintain temperature
• No glow at all: Igniter completely failed
• Intermittent ignition: Lights sometimes, fails others — igniter nearing end of life
• Visible cracks: Inspect with furnace off and power disconnected

DIY Replacement

Igniter replacement is one of the few furnace repairs suitable for handy homeowners: turn off power and gas, remove 2-4 screws, disconnect wire harness, install new igniter. Takes 15-30 minutes. Key precaution: never touch the element with bare hands — skin oils create hot spots that cause premature failure.

For Goodman furnaces, common igniter part numbers include B1401018S and 0130F00008. Always match by model number for proper fit.

The Bottom Line

A failed igniter is one of the cheapest furnace repairs — $10-75 for the part DIY, $100-300 with a service call. Don't let anyone say a failed igniter means you need a new furnace. But if your furnace is 15+ years old with multiple failures, a new Goodman from Furnace Direct at factory-direct pricing is the smarter long-term investment.