How Long Does a Furnace Igniter Last? Signs It Is Failing

A hot surface furnace igniter typically lasts about 3 to 5 years if it is the older silicon carbide type and roughly 5 to 10 years if it is the newer silicon nitride type. The first cold snap of the season is when a worn one gives out, so the sooner you recognize the signs, the less time you spend in a cold house. Below we cover what shortens an igniter's life, how to tell a failing igniter from other no-heat problems and what a replacement involves in Littleton.

How long does a furnace igniter last?

A furnace igniter is the part that lights your burners, and on most modern gas furnaces it is a thin ceramic element that glows white-hot before the gas valve opens. Its lifespan depends mainly on the material and on how many times it cycles on and off.

• Silicon carbide igniters are the older, more brittle design and often last around 3 to 5 years.
• Silicon nitride igniters are sturdier and commonly reach 5 to 10 years.
• Universal replacement igniters are often cited as shorter-lived than the original manufacturer part, in the range of 2 to 5 years.

These ranges are averages, not guarantees. A furnace that cycles hundreds of times a winter in a cold home wears an igniter faster than one that runs in a mild climate.

What shortens a furnace igniter's life

An igniter fails from heat stress, contamination and electrical wear, and a few common habits speed all three up. These are the factors we see most:

• Heavy cycling. Every start heats the element from cold to glowing, and the repeated expansion and contraction eventually cracks it.
• A clogged filter. Restricted airflow makes the furnace run hot, and that heat stresses the igniter along with other parts.
• Dust and debris. A film of dust on the element can create hot spots.
• Skin oils. Touching the ceramic with bare fingers leaves oil that can cause cracks the first time it heats.
• Unstable power. Voltage surges and loose connections can overstress a hot surface igniter.

With good care a silicon nitride igniter can approach the top of its range, while neglect can cut its life roughly in half. Our Furnace Tune-Up, Maintenance & Filter Replacement in Littleton visits include cleaning and testing the ignition circuit for exactly this reason.

What are the signs a furnace igniter is failing?

The clearest sign of a failing furnace igniter is a furnace that tries to start but never lights, with no glow at the igniter at all. Most failures give a few earlier warnings, and they usually show up in this order:

1. Slow starts. Lighting drags out, or the furnace needs several tries before the burners catch.
2. Short cycling. The furnace starts, then shuts off before the house warms up.
3. The blower runs but the air is cold. The fan starts, but the burners never fire.
4. Clicking with no flame. You hear the start sequence, but nothing ignites.
5. A visible crack. The element looks cracked, chalky or discolored when you look through the viewing port.

An igniter that glows orange for a few seconds and then goes dark has usually done its job, and the problem is later in the chain. An igniter that never glows is the more common culprit. If your furnace has been clicking and refusing to light, we explain how we test it on our Furnace Ignition & Pilot Light Repair in Littleton page.

Is it the igniter or something else?

No-flame calls are not always the igniter's fault, and swapping the wrong part wastes money. Four other parts can mimic the same symptoms:

• A dirty flame sensor lets the burners light, then shuts them off within a few seconds.
• A weak gas valve may let the igniter glow but never release gas.
• A faulty thermostat or control board can stop the sequence before the igniter even gets power.
• A choked filter or an overheated limit switch can lock the furnace out as a protection.

The test is simple. If the igniter glows and gas flows but the flame drops out, look at the sensor, and our page on Furnace Flame Sensor & Short Cycling Repair in Littleton covers that case. If the igniter never glows, the igniter or its power supply is the suspect.

What does igniter replacement involve and cost in 2026?

Replacing a furnace igniter is one of the shorter furnace repairs, and typical 2026 pricing for a professional visit commonly runs about $150 to $300 including the part, labor and a service call. The part alone is often $30 to $80 for an original manufacturer igniter. The total is agreed with you before any work begins.

Here is what a replacement involves on our visits:

• We shut off power and let the old igniter cool.
• We meter the igniter and the voltage reaching it, since a bad connection can pass for a dead element.
• We install the new igniter by its base, without touching the element.
• We run the furnace through several full heating cycles to confirm it lights cleanly every time.

If the old igniter had cracked, we also check the gas valve and the flame sensor, because a tired furnace may have more than one weak part.

Can you replace a furnace igniter yourself?

Handy homeowners do replace igniters, and the job is physically simple, but several details make it risky. The part has to match the furnace model, the power must be off, and the element cannot be touched. A wrong part or a poor connection can lead to repeat failures.

Warranty rules also matter. Many manufacturer warranties cover the part but require professional installation, so a do-it-yourself swap can leave you paying for the part again. If your furnace is still under warranty, check the terms before you open the cabinet.

Never work on gas lines or the gas valve yourself.

Igniters across Littleton's neighbors

Igniter age varies a lot from one neighborhood to the next, because it follows the furnace and not the address. In Centennial, where homes were built in many different decades, we see both the older silicon carbide design and newer silicon nitride parts, and our Furnace Repair in Centennial page explains how we handle calls there.

The same is true in Greenwood Village, where larger homes can run two furnaces, each with its own igniter. You can read about our approach on the Furnace Repair in Greenwood Village page.

Common mistakes with a failing igniter

Most igniter headaches come from a handful of avoidable mistakes. Here is what to skip:

• Touching the element. Even clean fingers leave oils that can crack it.
• Replacing the igniter without checking the cause. A clogged filter or a power problem can destroy the new one too.
• Buying the cheapest universal part. A poor match can burn out in a season or two.
• Heating with the gas range. A stove burner is not a heat source and adds carbon monoxide to the room.
• Waiting for the coldest night. Weak igniters often fail on the first hard freeze, so a checkup in autumn is cheaper than an emergency call.

When to call a professional

Call a professional when the furnace clicks without lighting, when the igniter never glows or when the furnace has failed to start more than once in a day. Furnace Repair Littleton Pros tests the igniter, the gas valve and the flame sensor so you only pay to replace what has actually failed.

A rotten-egg smell means leave the house first, then call 911 or the gas utility from outside. Do not keep resetting the furnace.