Your furnace kicks on, the thermostat calls for heat, and then nothing. No warm air. Just a cold house in the middle of a Michigan winter. If that sounds familiar, a failing ignitor is one of the most likely culprits.
The good news is that ignitor replacement is one of the more straightforward furnace repairs. The better news is that catching the signs early can keep you from dealing with a full breakdown on a January night in Royal Oak or Bloomfield Hills.
Here is what you need to know about how ignitors fail, what the warning signs look like, and what repair typically costs in Southeast Michigan.
What a Furnace Ignitor Actually Does
Modern furnaces use an electronic ignitor rather than a standing pilot light. When your thermostat calls for heat, the ignitor heats up and lights the gas burner – a sequence that takes just a few seconds.
There are two main types. A hot surface ignitor glows red-hot to ignite the gas. An intermittent pilot ignitor uses a small electric spark. Hot surface ignitors are by far the most common in residential furnaces built over the last two decades.
When the ignitor fails, the burner never lights. The furnace runs through its startup cycle, detects no flame, and shuts itself down as a safety measure. The result is no heat.
Signs Your Furnace Ignitor Is Failing
Ignitors do not always quit all at once. They often degrade gradually, giving you warning signs before a complete no-heat situation develops.
The Furnace Starts but Produces No Heat
This is the clearest sign. You hear the furnace attempt to start, the blower may even run, but no warm air comes through the vents. The system cycles on and off without ever producing heat.
The Furnace Starts and Then Shuts Off Quickly
A weak ignitor may light the burner inconsistently. When that happens, the flame sensor detects an unstable flame and shuts the system down as a precaution. You get short bursts of heat followed by silence.
Your Furnace Needs Multiple Attempts to Start
A furnace that eventually produces heat after two or three startup attempts may have an ignitor that is losing its ability to reach the right temperature reliably. It still works – but only barely.
You See an Error Code on Your Furnace
Many modern furnaces display error codes or flash indicator lights when a component fails. A lockout code or ignition failure code is a direct signal that the ignitor or the ignition sequence has a problem worth diagnosing.
Your Furnace Is More Than 7 to 10 Years Old
Hot surface ignitors typically last around 7 to 10 years. If your furnace is in that range and you are experiencing intermittent heat issues, the ignitor is a strong candidate even before a clear failure shows up.
What Furnace Ignitor Replacement Costs in Michigan
Ignitor replacement is generally one of the more affordable furnace repairs. The part itself is relatively inexpensive, and an experienced technician can usually complete the job in under an hour.
That said, final cost depends on a few factors:
- The furnace brand and model. Some ignitors are standard and widely available. Others are proprietary to a specific brand or system and cost more.
- Accessibility. A furnace tucked into a tight utility closet or an awkward basement space takes more time to service than one in an open mechanical room.
- Whether other components need attention. What looks like a straightforward ignitor failure sometimes turns out to be a combination of issues – a dirty flame sensor alongside a weakened ignitor, for example. Diagnosing and addressing both adds to the total.
Because pricing varies by system and situation, High Comfort does not publish flat rates. A technician will assess your specific furnace and give you a clear picture before any work begins. Right now, you can also save $20 off any repair when you contact the team.
Can You Replace a Furnace Ignitor Yourself?
Ignitors are available at HVAC supply stores, and some homeowners do attempt the swap on their own. There are real reasons to think twice, though.
Hot surface ignitors are fragile. The natural oils on your fingertips can crack the ceramic element if you touch it directly, and a cracked ignitor fails immediately or shortly after installation.
More importantly, confirming that the ignitor is actually the problem requires testing with a multimeter and understanding the full startup sequence. If you replace the ignitor and the furnace still does not light, you have spent time and money without solving anything. The real issue could be the flame sensor, the control board, the gas valve, or a pressure switch.
A technician can confirm the fault before replacing anything, which protects you from unnecessary parts costs and repeat service calls.
When Replacement Makes More Sense Than Repair
If your furnace is under 10 years old and otherwise in good shape, ignitor replacement is almost always the right call. It is a targeted fix for a specific component.
If your furnace is 15 years or older, the ignitor failure is worth using as a prompt to evaluate the whole system. Older furnaces lose efficiency over time, and repair costs have a way of adding up. A Bryant system installed through High Comfort comes with the reliability of an authorized dealer installation, and promotional financing is available to make a replacement more manageable if that is the direction you decide to go.
You do not have to make that call on your own. A technician can walk you through an honest comparison of repair versus replacement based on your actual system.
Serving Southeast Michigan Homeowners
High Comfort provides heating repair and service across Southeast Michigan, including Birmingham, Berkley, Southfield, West Bloomfield, Novi, Royal Oak, Clawson, and surrounding communities. When your furnace stops producing heat, you want someone who knows the area and can respond without a long wait.
Whether you need a quick ignitor swap or a full system assessment, the process starts with a call and a technician visit to diagnose the issue accurately.
Frequently Asked Questions
How long does furnace ignitor replacement take?
In most cases, a technician can complete the diagnosis and replacement in a single visit, often within an hour or two depending on the furnace model and how accessible it is.
How do I know if it is the ignitor or something else?
The symptoms of an ignitor failure overlap with other issues like a faulty flame sensor or a bad control board. A technician uses diagnostic tools to confirm which component has failed before replacing anything.
How long does a furnace ignitor last?
Hot surface ignitors typically last 7 to 10 years, though some fail earlier depending on usage cycles and the specific furnace model.
Is it safe to run my furnace if the ignitor is failing?
If the ignitor is weak but still functioning intermittently, the furnace will cycle on and off without producing steady heat. It is not a safety hazard in most cases, but it is worth getting diagnosed promptly – especially before the coldest months hit.
Does High Comfort service all furnace brands?
High Comfort services a wide range of residential furnace brands and is an authorized Bryant dealer and installer. Contact the team to confirm compatibility with your specific system.
What is included in a furnace diagnostic visit?
A technician will inspect the ignitor, flame sensor, control board, and other components involved in the startup sequence to identify the root cause before recommending a repair.
Is financing available for furnace repairs or replacements in Michigan?
Promotional financing is available for major HVAC purchases through High Comfort. If a repair assessment points toward a full system replacement, ask about financing options when you schedule your visit.
If your furnace is not producing heat or you are noticing any of the warning signs above, do not wait for a full breakdown. Contact High Comfort to schedule a service visit and get a clear diagnosis from a technician who knows Southeast Michigan homes.
