Furnace Not Heating? Get Expert Furnace Repair Services in Oakville

Furnace repair services in Oakville fix systems that quit heating when you need them most. Your furnace starts making weird grinding noises. Or it runs constantly but your house never gets past 65 degrees. Maybe your gas bills doubled this winter for no reason. Something’s broken, and ignoring it just makes the problem worse and more expensive. We diagnose what’s actually wrong, explain it without confusing technical jargon, and fix it before it turns into a complete breakdown.

Furnace Repair Services

Common Furnace Problems We Fix Daily

Furnaces break in predictable ways. The ignitor that lights the burners fails—this is super common on newer furnaces. Instead of a pilot light that stays on all the time, modern furnaces have electronic ignitors that click on when heat is needed. They burn out eventually, usually after 5-7 years. Your furnace tries to start, you hear clicking, but nothing happens. That’s a dead ignitor.

Blower motors fail from running constantly. The blower is what pushes warm air through your ducts into your house. It spins thousands of times per day all winter. Motors wear out, bearings go bad, belts break on older units. You’ll hear squealing or grinding before the motor completely dies. Flame sensors get dirty and shut the furnace down thinking there’s a problem when everything’s actually fine. Gas valves stick. Limit switches fail. Thermostats quit communicating with the furnace.

Most furnace repairs are straightforward—swap the bad part for a new one, test everything, heat comes back on. We see the same failures over and over across different brands. Carriers, Tranes, Lennox, Rheem—they all have the same wear parts that eventually need replacing.

Why Your Furnace Runs But Won’t Heat Properly

Your furnace kicks on, you hear it running, but your house stays cold. This drives people crazy because the system seems like it’s working. Most of the time it’s a problem with airflow. Your air filter is completely clogged, blocking air from getting into the furnace. The furnace runs but can’t pull enough air through to heat properly. Or your return vents are blocked by furniture. Or someone closed too many vents in unused rooms trying to save money, which actually makes the whole system work worse.

Ductwork leaks cause the same problem. Your furnace heats air perfectly fine, but half of it leaks into your attic or crawl space before it reaches your rooms. The furnace runs constantly trying to keep up and never quite gets there. Gas pressure being too low means burners can’t produce enough heat. The flame should be blue and steady—if it’s yellow or weak, you’re not getting full heat output. Understanding how heating systems should operate helps identify when something’s not working correctly.

Sometimes the problem is your thermostat lying to the furnace. It tells the system your house is 68 degrees when it’s actually 62. Furnace shuts off thinking the job is done. You’re left freezing wondering why your heat won’t work.

Furnace Making Strange Noises – What They Mean

Every furnace makes some noise—air moving through ducts, burners firing up, blower motor running. But certain sounds mean something’s actually wrong. Loud banging when your furnace starts up usually means delayed ignition. Gas builds up before igniting all at once instead of lighting smoothly. This is dangerous and needs fixing immediately. It can crack your heat exchanger.

Squealing or screeching points to blower motor bearings going bad or a belt that’s worn out and slipping. The sound gets worse over time as parts deteriorate. Grinding means metal rubbing on metal somewhere it shouldn’t—usually the blower wheel hitting something or motor bearings completely shot. Rattling could be loose panels, ductwork vibrating, or something fallen into the blower assembly.

Clicking that won’t stop is often the ignitor trying to light but failing. Furnace keeps trying over and over. Rumbling or roaring after burners shut off might be your heat exchanger cracking. That rumble is flames where they shouldn’t be. Whistling means air leaking somewhere—could be ductwork, could be a cracked heat exchanger. Don’t ignore weird noises hoping they’ll go away. They get worse and cause bigger problems.

Pilot Light and Ignition Issues

Older furnaces have pilot lights that stay lit all the time. The pilot goes out, your furnace won’t start. Usually the thermocouple failed—this is the safety device that shuts off gas if the pilot isn’t lit. Replacing a thermocouple takes about 15 minutes. Sometimes the pilot orifice gets dirty and won’t stay lit. Clean it out and the pilot stays on fine.

Newer furnaces don’t have pilot lights. They have electronic ignition—either hot surface ignitors that glow orange to light the gas, or spark ignitors that work like a spark plug. Hot surface ignitors are fragile ceramic that crack from age and heat stress. They last 5-10 years usually. You’ll see them glowing but not lighting the gas, or they don’t glow at all. Replace the ignitor and the furnace fires right up.

Spark ignition systems click repeatedly trying to light. If you hear clicking but no ignition, either the ignitor is bad or the flame sensor thinks there’s no flame when there actually is. Could also be the gas valve not opening when it should. We diagnose which part failed and swap it. Most ignition problems are $200-400 fixes, not major repairs.

Furnace Repair Costs vs Replacement Costs

Basic furnace repairs run $200-600 depending on what failed. Ignitor replacement costs $200-350. Flame sensor cleaning or replacement runs $150-300. Blower motor replacement costs $400-800 depending on the motor. Limit switch, pressure switch, gas valve—these all fall in the $200-500 range. If your furnace is under 15 years old and just needs a worn part replaced, repair makes sense.

Cracked or compromised heat exchangers change everything. The heat exchanger is where combustion happens—it heats the air without mixing exhaust fumes into your house. When it cracks, carbon monoxide can leak into your home. Heat exchanger replacement costs $1,500-3,000 in labor and parts. But if your furnace is over 15 years old with a cracked heat exchanger, replacement makes way more sense than repair. You’re putting $2,500 into a furnace that’s already old and will need more repairs soon.

Control board replacement runs $400-800. If your 20-year-old furnace needs a control board, you’re probably better off replacing the whole thing. But a 5-year-old furnace with a bad board? Repair it. Age matters as much as repair cost. We’ll walk you through whether repair or replacement makes financial sense for your specific situation. Our emergency furnace repair services are available when you need fast help, but we’ll always tell you honestly if replacement makes more sense.

How Long Does a Furnace Repair Actually Take

Simple repairs finish in under an hour. Ignitor replacement, flame sensor cleaning, thermostat replacement—these are quick fixes. We show up, diagnose the problem, swap the part, test everything, and leave. You have heat again within an hour of us arriving.

Blower motor replacement takes 2-4 hours depending on how accessible the blower is. Some furnaces you can reach the blower easily. Others we’re pulling the whole unit apart to get at it. Gas valve replacement runs 1-2 hours. Heat exchanger replacement—if you’re actually doing it instead of replacing the furnace—takes 4-8 hours because we’re basically tearing the furnace apart and rebuilding it.

Most furnace repairs we do are same-day fixes. We carry common parts on the truck. You call in the morning, we’re there by afternoon, furnace works before dinner. Unusual parts might need ordering, which means next-day repair. But 80% of what breaks on furnaces is stuff we already have with us. If you’re tired of dealing with recurring problems, our furnace maintenance and tune-up services help prevent breakdowns before they happen.

What Most Furnace Companies Won’t Tell You

Some Furnace Problems Are DIY Fixes

Here’s something most HVAC companies won’t admit: sometimes the problem is so simple you can fix it yourself. Your furnace won’t start and a company charges you $150 just to show up and flip the emergency shut-off switch that someone accidentally turned off. Or they “diagnose” a clogged air filter and charge $200 to replace a $15 filter you could’ve swapped yourself in 30 seconds.

We’ll walk you through basic troubleshooting over the phone before sending a truck. Check your thermostat batteries. Make sure the furnace switch is on. Look at your air filter—is it completely packed with dust? Try those things first. If that fixes it, great, you saved money. If it doesn’t, then we come out and actually fix what’s broken. Companies that make their money on service call fees aren’t going to help you solve problems for free.

Most Furnace Repairs Don’t Require “Emergency” Pricing

Your furnace quits at 8 PM on a Tuesday. You call around and everyone wants to charge emergency rates—$300 just to show up, parts extra. Here’s the thing: unless it’s below freezing outside and you have no heat whatsoever, it’s probably not an actual emergency. You can survive one night with extra blankets and we’ll come first thing in the morning at regular rates.

Real emergencies are when your house drops below 50 degrees with elderly family members or young kids. Or when your furnace is actively leaking carbon monoxide. Those situations need immediate response and emergency pricing makes sense. But “it’s chilly and inconvenient” isn’t the same as “dangerous emergency requiring middle-of-the-night service.” We’re available 24/7 for actual emergencies, but we’ll be honest with you about whether your situation can wait until morning to save you money.

Get Honest Furnace Repair Service

Call (314) 600-2202 for furnace repair in St. Louis. We’ll diagnose what’s actually wrong and fix it right. Available 24/7 when you genuinely need emergency help, and honest about when you don’t.