Lennox Furnace Repair Nationwide

Lennox Furnace Repair in Marietta: What to Know First

We repair Lennox furnaces across Marietta as an independent Lennox service provider, and most jobs are completed the same day we diagnose them. You’ll get a written price before any work starts, and every repair carries our 365-Day Done Right Promise. If the fix doesn’t hold, we return at no charge.

Call (478) 662-5175

If you own a Lennox furnace in Marietta and it’s blowing cold air, short-cycling, or making a noise it didn’t make last winter, this page tells you what’s likely wrong, what it costs to fix, and exactly how we’ll handle the job. Call (478) 662-5175 and a live person answers, 24/7.

Key takeaways:

• Lennox furnace repair in Marietta runs $150 – $700 for the large majority of jobs, parts and labor included.
• We’re independent, not a Lennox authorized dealer – that means we fix what’s broken without pushing a replacement.
• Every job starts with a written price. No work begins until you see and approve it.
• Your repair is guaranteed for 365 days. If it fails, the second visit is free.

How Lennox Products Fail – and How We Fix Them

Lennox builds efficient, tightly-engineered furnaces, and we’ve worked on enough of them in Marietta to know which models develop which problems. Here’s what we see most often:

• Elite and Signature series pressure switch faults. The SLP98 and EL296 are common in larger Marietta homes, and they’re sensitive to condensate drainage. When the drain line gets partially blocked by the kind of dust and lint we see constantly in Cobb County homes, the pressure switch reads it as a venting failure and locks the furnace out. The furnace isn’t dying – it’s protecting itself. We clear the drain, verify switch operation, and the furnace comes back. The cheap outside fix is a new switch. The real fix usually costs less.
• Merit series ignitor failures. The ML193 and ML180 use a silicon nitride hot surface ignitor that weakens over repeated heat cycles. In Marietta, where furnaces cycle hard through damp, cold winter nights, we replace ignitors on these units more than any other Lennox part. Symptom: the blower runs, but the burner never lights. The ignitor cracks or the resistance drifts out of spec. It’s a $150 – $300 fix and takes about an hour.
• SLP98/EL296 variable-speed blower motor module failures. The motor itself is usually fine. The control module on the back of the motor takes the hit from power fluctuations and age. You’ll hear a humming blower that won’t spin up, or the blower will surge. A module replacement beats a $900+ motor replacement, and we test both before recommending either.
• G61 and G71 series heat exchanger corrosion. These older Lennox lines are still running in plenty of Marietta ranch homes and split-levels from the 1990s and early 2000s. The failure mode is specific: small cracks near the crimp rings on the secondary heat exchanger, which can let combustion gases into the air stream. If we find this during a repair visit, we’ll show you the evidence and shut the furnace down if it’s unsafe. This is the one repair where replacement sometimes genuinely makes more sense, and we’ll tell you straight if that’s the case.
• Gas valve reluctance on high-efficiency units. Across the SLP and EL lines, the gas valve can get sticky after years of sitting dormant through long Georgia summers. The symptom is specific: the ignitor glows, the furnace clicks, nothing lights. We test the valve’s response before condemning it, because a weak flame sensor can mimic the same behavior. A new flame sensor is a $150 job. A new gas valve runs $250 – $450. We don’t sell the expensive one when the cheap one fixes it.

Devin Marlowe’s take on Lennox parts: we use Lennox OEM parts whenever the repair touches safety or warranty-sensitive components – heat exchangers, gas valves, pressure switches. For commodity parts like ignitors, flame sensors, and blower capacitors, quality aftermarket options often match or beat OEM at a lower price, and we’ll tell you when that’s the case. We won’t put a part in your furnace that we wouldn’t put in our own.

Our Lennox Furnace Repair Process

Here’s how a typical Lennox call goes from start to finish.

1. 1
   You call (478) 662-5175. A live person answers, day or night. We take your address, the furnace model if you have it handy, and what you’re seeing and hearing. Then we send you the technician’s name and photo before they drive out, so you know exactly who’s coming to your door.
2. 2
   The diagnostic. The tech arrives in uniform, shows photo ID at the door, and goes to work. We check error codes, ignite the system safely if possible, test gas pressure, inspect the ignitor and flame sensor, and look closely at anything specific to your Lennox model line. We find the problem, not just the symptom.
3. 3
   The written quote. You get the diagnosis in plain language and the repair price in writing before anything is touched. No work starts without your okay. If the furnace has multiple issues, we tell you what has to be done now, what can wait, and what it costs either way.
4. 4
   The parts decision. We tell you whether OEM or a quality aftermarket part makes sense for your repair, and why. Price is part of it. Safety and longevity are the rest.
5. 5
   The repair and the test. We fix it, then run the furnace through a full cycle – ignition, flame stability, temperature rise, limit operation, shutdown. If it doesn’t hold on our watch, it doesn’t leave our watch.
6. 6
   The cleanup and the guarantee. We leave the space cleaner than we found it and hand you a written guarantee that says exactly what’s covered and for how long. Every repair: 365 days. If it fails inside that year, we return and re-fix it free. No argument, no invoice.

Tell me what it’s doing, and I’ll tell you what it needs – no guesswork, no upsell.

What Lennox Furnace Repair Costs in Marietta

Most Lennox furnace repairs in Marietta land between $150 and $700 with parts and labor included. Where your job falls depends almost entirely on which component failed and which Lennox line you own.

• Ignitor or flame sensor replacement: $150 – $300
• Pressure switch replacement: $180 – $350
• Blower motor module or capacitor: $150 – $450
• Gas valve replacement: $250 – $450
• Blower motor replacement: $350 – $700
• Heat exchanger repair or replacement: $500 – $700, with a straight conversation about whether replacement makes more sense

What moves the price: the part itself, whether we’re using OEM or aftermarket by your choice, and the age of the unit. Labor on a clean, accessible Lennox is faster. On a 25-year-old G-series shoehorned into a tight Marietta utility closet, it takes what it takes. You’ll know the price before we turn a wrench, and the estimate is free. Call (478) 662-5175 for an exact quote.

Why Marietta Homeowners Call Brandt HVAC Co Marietta for Lennox Work

We know Lennox furnaces cold, but so do a few other shops in town. What sets us apart is how we run the visit.

Every Brandt technician is background-checked and identity-verified under the Threshold Verified standard. Before your appointment, you get a name and a photo. When the tech arrives, they show you a photo ID badge at the door. If anyone shows up who you weren’t told to expect, that visit is on us. We built the company this way because opening the door to a stranger is a real concern, especially for parents with young kids, people home alone, and older homeowners. You should never have to guess who’s in your house.

Beyond that: our repairs carry a written 365-day guarantee with a free second visit if the repair fails. If your Lennox needs a part that isn’t available same-day, we’ll tell you when it will be and get it ordered. And if you’re weighing repair against replacement, we service Carrier and Trane too – so we’ll give you an honest comparison, not a push toward whatever we stock. That’s the whole point of the Brandt name: an old word for a firebrand, the thing that keeps a home warm. It’s the only thing we’re here to do.

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