Furnace Igniter Replacement: The #1 DIY Furnace Repair Every Homeowner Should Know

Your furnace igniter is a small ceramic or silicon nitride component that glows red-hot to light the gas burner. When it fails, your furnace won't produce any heat — even though everything else may seem to be working fine. Igniter failure is the single most common furnace repair in Minnesota, and it's one of the cheapest and easiest to fix if you know what you're dealing with.

How a Furnace Igniter Works

When your thermostat calls for heat, the furnace control board runs through a startup sequence: the inducer fan starts (pulling air through the heat exchanger for combustion), the pressure switch confirms proper venting, and then the igniter receives electrical current. The igniter heats up to approximately 1,800–2,500°F in about 30–60 seconds, glowing bright orange. Once at temperature, the gas valve opens, and the gas ignites on contact with the hot igniter surface.

After the gas lights, the flame sensor (a separate component) confirms the presence of flame, and the control board allows the system to continue operating. If the igniter can't reach ignition temperature or if the flame sensor doesn't detect flame, the board shuts down the gas valve as a safety measure and tries again. After 3–4 failed attempts, most boards lock out and require a manual reset.

Types of Igniters

• Silicon nitride igniters: The current standard in Goodman and most modern furnaces. These are more durable and heat up faster than older silicon carbide igniters. They resist cracking from thermal shock and typically last 5–8 years. Part cost: $15–$40.
• Silicon carbide igniters: The previous generation, found in furnaces from the 1990s–2000s. These are fragile — touching the surface with bare fingers deposits oils that create hot spots, causing premature cracking. They're being phased out but are still available as replacement parts. Cost: $10–$25.
• Spark igniters: Found in some older furnaces, these generate a spark (like a gas grill lighter) rather than using a hot surface. Less common in modern residential furnaces.

Signs of a Failing Igniter

Furnace Doesn't Ignite

The blower runs, the inducer fan runs, but the burner never lights. You might hear clicks from the gas valve trying to open, or you might see the diagnostic LED on the control board blinking a code for "ignition failure" or "no flame detected." If you can see the igniter through the furnace's inspection port, a healthy igniter should glow bright orange during the startup sequence. If it barely glows or doesn't glow at all, it's failing or failed.

Intermittent Ignition

Sometimes a failing igniter works, sometimes it doesn't. The furnace fires on some attempts but fails on others, leading to inconsistent heating. This is a sign the igniter is degrading — its resistance is changing, and it can't reliably reach ignition temperature every time. Replace it before it fails completely, ideally before the next -20°F night.

Visible Cracks

If you remove the igniter and see cracks in the ceramic surface, it needs replacement regardless of whether it's still functioning. A cracked igniter is operating on borrowed time and will fail without warning.

DIY Igniter Replacement

Replacing a furnace igniter is one of the most accessible DIY HVAC repairs. No gas work is involved — the igniter is purely electrical. Here's the process:

1. Turn off power to the furnace at the switch or breaker.
2. Remove the furnace access panel (blower compartment door).
3. Locate the igniter. It's a small ceramic element mounted near the burner assembly, connected by two wires.
4. Disconnect the wire connector. It's usually a simple two-pin plug. Don't pull on the wires themselves — grasp the connector.
5. Remove the mounting screw(s). Usually one or two screws hold the igniter bracket in place.
6. Install the new igniter. Reverse the process. Handle the new igniter by the ceramic base only — never touch the heating element with bare hands (especially silicon carbide).
7. Restore power and test. Set the thermostat to call for heat and watch the startup sequence through the inspection port.

Total time: 15–30 minutes. Total cost: $15–$40 for the part. Compare that to a service call: $150–$300 for a technician to do the same 15-minute job.

Finding the Right Replacement Igniter

To order the correct igniter, you need your furnace model number (found on the rating plate sticker inside the blower compartment door). Search for "igniter for [your model number]" and you'll find the correct part. For Goodman furnaces, common igniter part numbers include the 0130F00008 (fits many GMSS, GMEC, and GMVC models). When in doubt, bring the old igniter to an HVAC supply house — they can match it visually.

When It's Not the Igniter

Sometimes what looks like an igniter problem is actually something else:

Flame Sensor Issue

If the furnace ignites but shuts off within a few seconds, the flame sensor is the more likely culprit. The flame sensor is a separate metal rod positioned in the burner flame. When coated with oxidation, it can't detect the flame, and the board shuts down the gas valve. Cleaning the flame sensor with fine-grit sandpaper or steel wool fixes this 90% of the time.

Gas Valve Problem

If the igniter glows bright orange but gas never flows, the gas valve may have failed. This requires a technician to diagnose and replace.

Control Board Failure

If the igniter never receives power (doesn't glow at all and the diagnostic LED shows an error code), the control board may not be sending voltage to the igniter. Control board replacement costs $200–$500 and should be done by a qualified technician.

Pressure Switch Issue

The pressure switch must close before the control board sends power to the igniter. If the inducer fan is weak, the vent is partially blocked, or the pressure switch itself has failed, the board never advances to the ignition stage. You'll typically see a diagnostic code specific to pressure switch failure.

Igniter Lifespan and Prevention

Silicon nitride igniters last 5–8 years on average in Minnesota where furnaces log thousands of heating cycles per season. You can't prevent eventual failure — igniters are a wear item. But you can be prepared:

• Keep a spare igniter on hand. At $15–$40, having the correct replacement in your basement means you can fix the problem in 20 minutes rather than waiting hours or days for a service call during a cold snap.
• Note your furnace model number. Write it on a piece of tape and stick it to the furnace. When you need to order parts at midnight because your furnace died, you'll have it ready.
• Change your air filter regularly. Dirty filters cause overheating, which accelerates igniter degradation through excessive thermal cycling.

Cost: DIY vs. Professional Repair

A $20 igniter and 20 minutes of your time versus a $250+ service call. This is the single best DIY furnace repair to learn as a Minnesota homeowner. Every furnace will eventually need a new igniter — knowing how to replace one puts money back in your pocket every time.

When to Replace the Whole Furnace Instead

If your furnace is 15+ years old and the igniter is just one of several recent repair needs, consider whether replacement makes more sense than another repair. At Furnace Direct, Goodman furnaces start under $1,000 at factory-direct pricing. A new furnace with a 10-year parts warranty and modern 96% AFUE efficiency eliminates the cycle of escalating repairs on aging equipment. Same-day Twin Cities metro delivery for orders before 3 PM CT.