A modern furnace runs a strict startup sequence, and knowing where the sequence breaks is most of the diagnosis. The thermostat calls, the inducer motor spins up to prove draft through a pressure switch, the hot surface igniter glows, the gas valve opens, the burners light, the flame sensor confirms fire, and only then does the blower deliver heat to the house. In Collierville, TN, the failures cluster at predictable points: a flame sensor coated in oxide that can no longer prove the flame, a hot surface igniter cracked from years of thermal cycling, a pressure switch that will not close because the inducer is weak or the condensate trap on a high-efficiency model has clogged, or a control board with a burned relay. Each one stops the sequence cold, and each one mimics the others from the hallway.
Rather than guess, Collierville HVAC tests the sequence stage by stage. We read igniter resistance, measure flame signal in microamps, check that the pressure switch responds to real inducer draft, confirm voltage at the gas valve, and test the blower and its capacitor. Because this is a fuel-burning appliance, the safety basics come with every visit: the heat exchanger gets inspected, gas connections get leak-tested, and draft gets verified. You cannot tell a furnace problem from a furnace hazard by looking at the thermostat. Before we leave, temperature rise is measured against the data plate so the fire and the airflow are balanced as the manufacturer intended.
Collierville HVAC services natural gas, propane, and electric furnaces of every major brand, from standard 80 percent units to condensing high-efficiency models with their traps, drain lines, and dual pressure switches. Our trucks carry the parts that really fail, such as igniters, flame sensors, pressure switches, capacitors, inducer assemblies, and blower motors, so most homes have heat again before we leave. Call (901) 749-8008 for furnace repair anywhere in Collierville, and we can have someone out today.
For air conditioning breakdowns, see AC Repair in Collierville.
How Much Does Furnace Repair Cost in Collierville?
For most Collierville homes, a furnace repair runs $150 to $600. The price depends on which part failed and how old the furnace is. Every furnace repair starts with a real diagnosis and a clear price.
| Repair | Typical cost | What it usually means |
|---|---|---|
| Flame sensor cleaning or replacementFurnace lights, then shuts off within seconds | $80–$250 | Furnace lights, then shuts off within seconds |
| Hot surface igniter replacementFurnace clicks and tries to start but never lights | $150–$400 | Furnace clicks and tries to start but never lights |
| Draft inducer motorLoud humming or grinding at startup, then lockout | $400–$1,000 | Startup fan fails, furnace won't fire |
| Blower motorNo airflow, or the blower runs nonstop | $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 replacementValve fails to open, so the furnace never lights | $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.
What Affects the Price
- The age and efficiency of the furnace, since high-efficiency models use more specialized parts
- Whether a cracked heat exchanger is found, which usually means replacement rather than repair
- Same-day or after-hours service versus a planned visit
- How easy the furnace is to reach
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 (901) 749-8008 to get your price.
Warning Signs for Furnace Repair
Recognizing the warning signs early can save you time, money, and prevent significant damage to your property. Watch for these telltale signs that professional help is needed:
- A bang or boom when the burners ignite late
- A flame that burns soft and yellow rather than steady blue
- A furnace that shuts off every few minutes before the house warms up
- Water, rust stains, or black soot around the flue or cabinet
- Squeals, scrapes, or grinding noises behind the blower door
- A fan that keeps running while the registers blow cool air
- The furnace clicks and glows but the burners never light
- Burners light, run a few seconds, then shut down repeatedly
Act Before It Gets Worse
Most HVAC failures start small, a weak capacitor, a squealing blower, a system that runs a little longer each week. Don't wait, get Collierville HVAC on the phone at (901) 749-8008 and we'll take a look right away.
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Why Professional Furnace Repair Matters
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 the margin for error shrinks. 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 replacing a good switch only hides the real fault.
At Collierville 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.
What to Expect From Our Furnace Repair
We work through a clear, repeatable process so nothing gets overlooked on your property. Here's a look at each step our Collierville 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.
Safety Inspection
The heat exchanger is inspected, gas connections are leak-tested, and flue draft verified on every visit. A furnace repair that is not proven safe is not finished.
Expert Repair
We fix the confirmed fault, and since igniters, flame sensors, pressure switches, capacitors, and motors are on the truck, most furnaces are heating again the same visit.
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.
Maintenance Tips for Furnace Repair
A few simple habits now, like regular filter changes and seasonal tune-ups, can add years to your system's life. Here are our expert recommendations:
- Replace the filter every month while the furnace is working hard, since it costs less than any other part
- Pay attention when the burners light, since a boom instead of a soft whoosh calls for service
- Give the furnace room to breathe, since a crowded utility space starves the burners of air
- Keep storage, lint, and especially chlorine-based products away from the furnace closet
- If you have a high-efficiency furnace, check that the condensate drain is flowing freely
- Schedule service each fall to catch worn igniters and dirty sensors before cold weather arrives
- Keep a working carbon monoxide alarm on every level of the home and check it each month
Should You DIY or Call a Pro?
Online tutorials may help in a pinch, yet lasting repairs and code-compliant installations usually depend on professional methods and trained technicians. Here's a comparison:
| Factor | DIY Attempt | Professional Service |
|---|---|---|
| Heat Exchanger | Damage hidden inside the cabinet | Checked every time we open the unit |
| Ignition Faults | New igniter installed on a hunch | Each ignition component tested |
| Gas Connections | Small leaks missed entirely | Instrument leak test on each visit |
| High-Limit Trips | Limit replaced, cause left behind | The airflow fault behind the trip found |
| Airflow Match | Airflow assumed, not measured | Blower tuned to the rated rise |
| Verification | It lit once, call it fixed | Full cycles proven clean and safe |
Get Furnace Repair Help Today
Get your comfort back before a small fault becomes a full breakdown. Collierville HVAC is ready to respond fast.
Call (901) 749-8008 TodayFurnace Repair Across the Collierville Area
We serve Collierville and its neighboring communities for furnace repair, from quick same-day repairs to planned installs.