When to Replace Your Furnace Ignitor
Average lifespan, warning signs, and whether to repair or replace.
Average Lifespan
3-7 years
Replacement Cost
$8 - $25
Category
Home
How Long Does a Furnace Ignitor Last?
Furnace ignitors last 3 to 7 years, with most failing around the 5-year mark. The ignitor is a small ceramic element (usually silicon carbide or silicon nitride) that glows white-hot to light the gas burner when the thermostat calls for heat. It's the modern replacement for pilot lights... nearly all furnaces made after 2000 use a hot surface ignitor instead of a standing pilot flame. Silicon carbide ignitors (the older, more common type) are fragile and sensitive to physical shock, oils from your fingers, and thermal cycling. Every time the furnace kicks on, the ignitor heats from room temperature to 2,500+ degrees in seconds, then cools back down when the burner lights. That thermal stress causes micro-cracks in the ceramic over thousands of cycles. Silicon nitride ignitors (found in newer furnaces) are more durable and resistant to breakage, but they still wear out from thermal cycling. They typically last 5 to 8 years. The ignitor is almost always the first component to fail in a gas furnace. When your furnace clicks on but doesn't produce heat... especially on the first cold night of the season after sitting idle all summer... the ignitor is the most likely culprit. It's also the cheapest and easiest furnace repair you can do yourself.
Warning Signs It's Time to Replace
Signs your furnace ignitor is failing or going bad
If you're seeing two or more of these, it's time to start shopping.
- ⚠️Furnace clicks on but no heat comes out — The thermostat sends the signal, the inducer fan starts, but the burner never lights. The ignitor isn't getting hot enough to ignite the gas. The furnace tries 3 to 4 times, then locks out with an error code.
- ⚠️Furnace short-cycles (starts and stops repeatedly) — A weak ignitor may light the gas inconsistently... sometimes it catches, sometimes it doesn't. The furnace starts, runs for a few minutes, shuts down, then tries again. This puts wear on the entire system.
- ⚠️Visible crack in the ignitor element — If you can see the ignitor (remove the burner access panel and look), a cracked ceramic element is a dead giveaway. Even a hairline crack means replacement is imminent.
- ⚠️Ignitor glows orange instead of white-hot — A healthy ignitor glows bright white or light orange. If it glows a dull orange or red and takes a long time to heat up, the element is degrading and won't reliably light the gas.
- ⚠️Error code on the furnace control board — Most modern furnaces have an LED on the control board that flashes error codes. A code indicating "ignition failure" or "no flame detected" usually points to the ignitor. Check your furnace manual for the specific code meanings.
- ⚠️Furnace works intermittently in cold weather — Ignitors that are on the edge of failure often work when the furnace cycles frequently (keeping the element warm between cycles) but fail on the initial cold start after hours of inactivity. This is why they tend to fail on the coldest night.
Should You Repair or Replace?
Ignitors are always replaced, never repaired. The part costs $8 to $25 on Amazon and takes 15 to 20 minutes to swap. This is the single best DIY furnace repair... it saves you a $150 to $400 service call for a part that costs less than a pizza. The process: turn off the furnace at the thermostat and the power switch (usually on or near the furnace), remove the burner compartment access panel, locate the ignitor (a small ceramic element mounted near the burners with two wires), disconnect the wire connector (it's a simple plug), remove the 1 or 2 mounting screws, install the new ignitor (DO NOT touch the ceramic element with bare fingers... oils from your skin create hot spots that cause premature failure), reconnect the wire, replace the panel, and restore power. The only thing you need to get right is ordering the correct ignitor for your furnace model. Look at the rating plate on the furnace for the model number, then search "replacement ignitor for [your model number]" on Amazon. Universal ignitors ($8 to $15) work for many furnaces. OEM ignitors ($15 to $30) are model-specific but guaranteed to fit.
🔧 Repair if...
- • It's less than 1 years old
- • This is the first major issue
- • Repair cost is under $2 - $7
- • The rest of the unit is in good shape
🔄 Replace if...
- • It's past 3 years
- • This is the second or third repair
- • Repair quote is over $4 - $12
- • Newer models would save you money on energy
Replacement cost: A new furnace ignitor typically costs $8 - $25 installed. Prices vary by region, brand, and complexity of installation.
Cost to Replace a Furnace Ignitor
Full Replacement
$8 - $25
Labor is typically 0% DIY (15-20 minutes) or $150-$400 HVAC service call of total cost
Typical Repair
$8 - $25
Depending on the issue and your location
Prices vary by region, brand, and complexity. Get at least 3 quotes before committing... and don't automatically go with the cheapest. A bad installation costs more in the long run.
Common Furnace Ignitor Repairs and What They Cost
Furnace Ignitor repair cost breakdown
| Repair | Typical Cost | Notes |
|---|---|---|
| Replace ignitor (DIY) | $8-$25 | 15-20 minutes. The most common furnace repair and the easiest. Two screws, one wire connector. |
| Replace ignitor (HVAC tech) | $150-$400 | The service call and labor account for 85%+ of the cost. The part is $8-$25. DIY saves you $125 to $375. |
| Clean flame sensor | $0 DIY | Sandpaper or steel wool on the thin metal rod near the burners. Takes 5 minutes. Fixes intermittent "no heat" that looks like an ignitor problem. |
| Replace flame sensor | $5-$10 DIY, $100-$200 installed | If cleaning the flame sensor doesn't work, replace it. Same easy process as the ignitor. |
| Control board replacement | $100-$300 DIY, $300-$600 installed | If the ignitor and flame sensor are both good, the control board may not be sending the ignition signal. More complex repair... worth calling a tech for diagnosis. |
Best Furnace Ignitor Brands
How Long Does It Take to Replace a Furnace Ignitor?
Ignitor replacement takes 15 to 20 minutes. First-timers should budget 30 minutes.
Tools needed: Phillips or 1/4-inch nut driver screwdriver. That's it.
Safety first: turn off the furnace at the thermostat, then flip the power switch on the furnace itself (usually a standard light switch on or near the unit). You don't need to shut off the gas... you're not touching any gas lines.
Process: remove the burner compartment panel (usually the lower panel), locate the ignitor (a small ceramic element mounted near the burner tubes, with two wires running to a plug connector), unplug the wire connector (gentle pull... don't yank), remove the 1 or 2 screws holding the ignitor bracket, slide the old ignitor out, slide the new one in (DO NOT touch the ceramic element), replace the screws, plug in the connector, replace the panel, restore power, and turn the thermostat to heat.
The furnace should cycle on within a minute. You'll hear the inducer fan start, then see the ignitor glow through the burner viewing window (if your furnace has one), then the burners should light. If it doesn't light on the first try, wait 5 minutes for the lockout to reset and try again.
How to Make It Last Longer
- ✓Never touch the ceramic ignitor element with bare fingers. The oils from your skin create hot spots on the element that lead to premature cracking. Handle it by the mounting bracket only. If you accidentally touch it, clean with rubbing alcohol.
- ✓Run the furnace for a test cycle in early fall before you actually need heat. Better to discover a failed ignitor on a 60-degree day than on a 10-degree night when every HVAC company has a 3-day wait.
- ✓Keep a spare ignitor on hand. They cost $8 to $15 and last indefinitely on the shelf. When the original fails at 11pm on a Saturday in January, you'll have the fix ready in your toolbox.
- ✓Change your furnace filter regularly. A clogged filter restricts airflow, causing the furnace to overheat and cycle more frequently... which puts extra thermal stress on the ignitor.
- ✓If you're replacing the ignitor, clean the flame sensor at the same time. The flame sensor is a thin metal rod near the burners that verifies the gas lit. A dirty flame sensor causes the same "no heat" symptom as a bad ignitor. Clean it with fine sandpaper or steel wool.
What We Recommend
Products that help with furnace ignitor maintenance and replacement.
White-Rodgers 767A-357 Hot Surface Ignitor
One of the most common universal ignitors. Fits a wide range of Carrier, Bryant, Payne, Lennox, and other furnaces. Silicon carbide element. Check compatibility with your model before ordering.
View on Amazon →
Universal Furnace Ignitor (Silicon Nitride)
Upgraded silicon nitride element that lasts longer than standard silicon carbide. Fits most major furnace brands with included adapter brackets. The "buy once, forget about it" upgrade.
View on Amazon →
Furnace Flame Sensor (Universal)
Replace the flame sensor at the same time as the ignitor... it's the other $8 part that causes "no heat" symptoms. A dirty or cracked flame sensor shuts down the burner even when the ignitor works perfectly.
View on Amazon →
Prices are approximate and may change. As an Amazon Associate we earn from qualifying purchases at no additional cost to you.
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Lifespans and costs are averages based on industry data. Your results may vary based on brand, usage, climate, and maintenance. Consult a professional for specific advice.