Furnace Ignitor Replacement Cost

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Furnace ignitor replacement is one of the more affordable furnace repairs: most homeowners pay $150 to $400 installed, with the ignitor part itself costing $20 to $80 and labor adding $100 to $250 for the service call and replacement. Silicon nitride igniters — now standard on most modern furnaces — last longer than older silicon carbide (glow plug) designs but cost slightly more when replaced.

What Affects the Cost

The furnace brand and ignitor type are the main variables. Older silicon carbide igniters are inexpensive and widely available at $15 to $40. Silicon nitride igniters — more common on furnaces manufactured after 2010 — run $40 to $80 for the part. OEM parts for proprietary brands may cost more than universal aftermarket equivalents, though your technician should confirm compatibility before substituting. Labor time is usually short — under an hour — making the service call fee a significant portion of the total cost. Emergency or after-hours service adds a premium. Some contractors include a diagnostic fee of $75 to $125 in the quoted price, so ask whether it is bundled or billed separately.

Signs You Need This Replacement

The most common symptom of a failed ignitor is a furnace that cycles but does not produce heat — the thermostat calls for heat, the inducer fan runs, but the burners never ignite and the furnace shuts off after a short lockout period. Some furnaces will attempt to ignite two or three times before entering a fault mode, sometimes with an error code visible on the furnace's diagnostic light or display panel. You may also hear the furnace starting its cycle but no burner flame establishing. A licensed technician can confirm ignitor failure with a resistance check — a cracked or open-circuit ignitor reads out of spec even if it does not look visibly broken.

Repair, Replace, or Call a Pro

Ignitor replacement is one of the best-value HVAC repairs: a relatively inexpensive part restores full furnace function. Even on an older furnace, it is typically worth replacing the ignitor rather than buying a new system — unless other factors suggest the furnace is near end of life. Do not attempt to handle or test the ignitor yourself. Silicon nitride igniters are extremely fragile and will fracture from the oils in your skin; even brief contact without gloves will cause premature failure. A licensed technician should handle and install the part, then verify burner ignition and flame sensor operation before completing the job.

Decision Guide

Repair or Replace? The Industry Rule

✓ Consider Repair When

→System is under 10 years old and well maintained
→Repair cost is less than 50% of replacement cost
→The rest of the system is in good mechanical condition
→No recurring breakdowns in the last 2 years
→Energy bills are not significantly elevated

⚠️ Consider Replacement When

!System is 15+ years old — average HVAC lifespan
!Repair quote exceeds 50% of new system cost
!Multiple breakdowns within the last 2–3 years
!R-22 refrigerant system — phased out, expensive to service
!Energy bills significantly higher than comparable homes

50% Rule — Industry Standard

If repair cost exceeds 50% of a new system's installed price, replacement is typically more economical — industry standard guideline used by licensed HVAC contractors nationwide.

SEER 2 Efficiency

Upgrading from minimum to ENERGY STAR certified high-efficiency SEER 2 system can reduce cooling energy costs by up to 30% (ENERGY STAR program data)

Editorial Standard: All contractor connections are to state-licensed, insured HVAC professionals. No unlicensed providers. Written estimates required before work begins.

✓ Compliance Reviewed — Licensed Contractors Only

Common Questions

Homeowner FAQ

How much does furnace ignitor replacement cost?

Furnace ignitor replacement typically runs $150 to $400 installed. The ignitor itself costs $20 to $80 depending on type (silicon carbide vs. silicon nitride) and brand. Labor adds $100 to $250 for the service call and replacement. A diagnostic fee of $75 to $125 may be billed separately or bundled into the total — ask before scheduling. Emergency or after-hours calls carry a premium of $50 to $150 or more over standard rates. Despite being one of the most common furnace repairs, always use a licensed HVAC technician — the ignitor itself is extremely fragile and must be handled correctly.

What causes a furnace ignitor to fail?

Furnace ignitors fail primarily due to age and thermal cycling — the ignitor heats to extremely high temperatures on every heating cycle, and the element eventually cracks or burns out. Silicon carbide igniters typically last 3 to 5 years; silicon nitride igniters last longer, often 7 to 10 years. Contamination from dust, moisture, or handling without gloves also accelerates failure. Power surges can crack or damage the element. In some cases, ignitor failure is a symptom of a larger problem — such as incorrect gas pressure, a failing flame sensor, or control board issues — so a licensed technician should confirm the ignitor is the primary fault before replacing it.

Can I replace a furnace ignitor myself?

While the mechanical process of swapping a furnace ignitor is not complex, it carries real risks that argue for a licensed technician. Silicon nitride igniters fracture from contact with skin oils — handling without clean gloves causes premature failure, and then you have paid for a part that fails within weeks. The work also involves the furnace's gas train and electrical components. Incorrect installation can leave the ignitor misaligned with the burner, result in failed ignition, or trip safety controls. A licensed HVAC technician can replace and verify the ignitor in under an hour at a cost that is worth the assurance of correct installation and a documented service record.

How long does a furnace ignitor last?

Silicon carbide ignitors — common on furnaces built before 2010 — typically last 3 to 5 years with normal use. Silicon nitride igniters, now standard on most new furnaces, are more durable and often last 7 to 10 years. Actual lifespan depends on how frequently the furnace cycles (more cycling in colder climates means shorter life), local gas quality, voltage stability, and whether the ignitor has ever been contaminated by moisture or skin contact during servicing. If your furnace is approaching 5 or more years without a service check, having a licensed technician inspect the ignitor's resistance reading is a worthwhile preventive step.

Is furnace ignitor replacement worth it on an old furnace?

In most cases, yes — a furnace ignitor is an inexpensive repair that restores full function. Even a furnace that is 15 years old is worth an ignitor replacement if the heat exchanger, blower motor, and other major components are in good condition. The repair cost of $150 to $400 is a small fraction of full furnace replacement. The exception is if the ignitor failure is paired with other significant issues — a cracked heat exchanger (a safety and carbon monoxide risk), a failing blower motor, or a control board problem — in which case a licensed technician may recommend evaluating the full system condition before deciding between repair and replacement.

Furnace Ignitor Replacement Cost: Honest Pricing Guide

What Affects the Cost

Signs You Need This Replacement

Repair, Replace, or Call a Pro

HVAC Failure in Extreme
Heat or Cold Cannot Wait

Furnace Ignitor Replacement Cost: Honest Pricing Guide

What Affects the Cost

Signs You Need This Replacement

Repair, Replace, or Call a Pro

HVAC Failure in ExtremeHeat or Cold Cannot Wait

HVAC Failure in Extreme
Heat or Cold Cannot Wait