Every time your thermostat calls for heat, the furnace runs a fixed checklist. The inducer motor starts and proves draft by closing a pressure switch, the hot surface igniter heats up, the gas valve opens, the burners light, and the flame sensor confirms there is fire. Only after all of that does the blower begin sending warm air into the house. Finding the step that fails is most of the job. Around Pontiac, MI, the usual failure points are an oxide-coated flame sensor, an igniter cracked by years of heating and cooling, a pressure switch that stays open because of a weak inducer or a clogged condensate trap on a high-efficiency unit, and control boards with burned relays. Any one of them halts the startup, and from the hallway they all look alike.
Our experienced technicians diagnose a furnace the way it operates, in order, with a meter at every step. That means igniter resistance, microamp flame signal, pressure switch operation under actual inducer draft, gas valve voltage, and blower and capacitor condition. Safety checks are never optional on a gas appliance: heat exchanger inspection, leak testing on the gas connections, and flue draft verification, since a hazard rarely shows itself at the thermostat. We finish by checking temperature rise against the data plate, making sure the burner and blower are matched the way the manufacturer designed them to.
We work on natural gas, propane, and electric furnaces from every major brand, both conventional 80 percent units and condensing high-efficiency models with their traps, drains, and dual pressure switches. The truck stock covers the parts that actually fail: igniters, flame sensors, pressure switches, capacitors, inducer assemblies, and blower motors, so most repairs finish in one trip. For furnace repair anywhere in Pontiac, call (248) 278-4190 and an experienced technician will be headed your way today.
When the AC quits in summer, see AC Repair in Pontiac.
How Much Does Furnace Repair Cost in Pontiac?
For most Pontiac homes, a furnace repair runs $150 to $600. Cleaning a flame sensor is a small job; replacing a blower motor or control board is a bigger one. Pontiac HVAC tests the system, finds the actual fault, and quotes the repair before any work begins.
| Repair | Typical cost | What it usually means |
|---|---|---|
| Flame sensor cleaning or replacementBurners light but cut out almost immediately | $80–$250 | Burners light but cut out almost immediately |
| Hot surface igniter replacementNo ignition; one of the most common winter failures | $150–$400 | Furnace clicks and tries to start but never lights |
| Draft inducer motorStartup fan fails, furnace won't fire | $400–$1,000 | Loud humming or grinding at startup, then lockout |
| Blower motorBurners run but little or no air comes out of the vents | $400–$1,500 | No airflow, or the blower runs nonstop |
| Control boardErratic behavior, error codes, or no response at all | $300–$700 | Erratic behavior, error codes, or no response at all |
| Gas valve replacementIgniter glows but gas never flows to the burners | $250–$700 | Igniter glows but gas never flows to the burners |
Ranges are typical for these repairs; you get an exact quote before any work starts.
Factors That Change the Price
- The age and efficiency of the furnace, since high-efficiency models use more specialized parts
- A cracked heat exchanger, which is a safety issue and usually points to replacement
- Timing, such as a no-heat call on a cold night versus a scheduled repair
- Access to the furnace in attics, closets, or crawlspaces
If your furnace is past 15 to 20 years old or the repair is a major one, we'll give you repair and replacement prices side by side. Call (248) 278-4190 to get your price.
Signs You Need Furnace Repair in Pontiac
Catching these issues early helps you avoid costly problems and protect your property. Watch for these telltale signs that professional help is needed:
- Yellow, wavering burner flames where they should be sharp blue
- Burners light, run a few seconds, then shut down repeatedly
- The furnace clicks and glows but the burners never light
- Squealing or grinding from the blower compartment
- Water, rust stains, or black soot around the flue or cabinet
- A bang or boom when the burners ignite late
- A furnace that shuts off every few minutes before the house warms up
- A fan that keeps running while the registers blow cool air
Act Before It Gets Worse
A failing capacitor, clogged condensate drain, or dirty flame sensor rarely fixes itself and usually gets more expensive to address the longer it runs. If you notice any of these signs, contact Pontiac HVAC at (248) 278-4190 for a prompt inspection.
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Call (248) 278-4190 TodayYour Furnace Repair Questions Answered
Why Hire a Professional for Furnace Repair?
The most serious furnace problem is usually hidden. A cracked or corroded heat exchanger can let combustion gases into the airstream, and nothing about it is visible from the outside of the cabinet. Delayed ignition makes things worse, because each boom at light-off puts more stress on that metal. Add high voltage, a gas valve, and a flue to the same box, and there is little room for guesswork. Diagnosis is full of traps too. A high limit that keeps tripping could be a bad switch, or it could be doing exactly its job because a filter is clogged or the blower is dying, and swapping out a working switch only hides the real fault.
At Pontiac HVAC, no symptom gets treated in isolation. A meter tells us the flame signal, so we never condemn a good sensor while the real culprit, a cracked igniter or a weak gas valve, keeps causing trouble. We confirm draft at both the pressure switch and the flue, measure temperature rise against the data plate to catch airflow problems early, and test the gas side with a leak detector, not a guess. When we are done, the furnace has proven itself safe and correct through a full cycle, and if it is nearing the end of its useful life, you will get an honest assessment.
Our Furnace Repair Process
We follow a proven process to ensure every repair and installation is completed to the highest standards. Here's a look at each step our Pontiac HVAC team takes:
Startup Sequence Testing
We watch the furnace's startup sequence and measure at every stage: inducer draft, pressure switch, igniter resistance, flame signal, and gas valve operation, to find exactly where it breaks.
Combustion Safety Check
On every visit, we inspect the heat exchanger, leak-test the gas connections, and confirm the flue is drafting. A repair is not complete until the unit is proven safe.
Same-Visit Repair
The typical repair finishes in one trip. The common failure parts, from igniters and flame sensors to pressure switches, capacitors, and motors, are stocked on the truck and ready to go.
Full Verification
Before we leave, the furnace runs full cycles while we check temperature rise against the data plate, listen for clean, quiet ignition, and test each limit and safety control.
Questions About Furnace Repair?
Our experienced technicians can assess your situation and recommend the best solution.
Call (248) 278-4190 TodayMaintenance Tips for Furnace Repair
A little routine maintenance goes a long way toward avoiding a mid-season breakdown. Put these technician-approved steps to work around your property:
- Change the filter monthly during heating season; it is the cheapest furnace part you will ever buy
- Make sure the furnace has clear combustion air; a packed utility room starves the burners
- On high-efficiency models, keep the condensate trap and drain line clear and draining
- Store laundry supplies, especially chlorine products, well away from the furnace closet
- Listen at light-off; clean ignition is quiet, and booming means the burners need service
- Schedule service each fall to catch worn igniters and dirty sensors before cold weather arrives
- Test your CO detectors monthly and make sure each floor has one
Should You DIY or Call a Pro?
While some minor tasks like changing filters or checking a thermostat can be handled by homeowners, most HVAC work involves refrigerant, gas combustion, and high-voltage electricity, jobs that call for professional expertise. Consider the following comparison:
| Factor | DIY Attempt | Professional Service |
|---|---|---|
| Exchanger Cracks | No way to see a crack from outside | Examined as standard on each call |
| Ignition Problems | Parts swapped against a code list | Igniter, sensor, and valve each metered |
| Gas Safety | Small leaks missed entirely | Instrument leak test on each visit |
| Limit Trips | A safety device jumpered out | Root cause of overheating corrected |
| Blower Setup | Blower speed left wherever it was | Temperature rise set to the data plate |
| Verification | One good start and done | Full cycles proven clean and safe |
Get Furnace Repair Help Today
Get your comfort back before a small fault becomes a full breakdown. Pontiac HVAC is ready to respond fast.
Call (248) 278-4190 NowWhere We Provide Furnace Repair
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