Lennox Furnace Repair Nationwide

Lennox Furnace Repair in San Antonio: What to Know First

Lennox furnace repair in San Antonio typically runs between $150 and $700 depending on the part that failed and how long it’s been failing. We’re an independent Lennox service provider – not factory-authorized, but factory-familiar – and we stock or can source most common Lennox parts same-day or next-day. Most repairs take under two hours once we’re at the unit.

Call (361) 470-8872

This page is for homeowners whose Lennox furnace is acting up and who want to know what’s actually wrong before a stranger shows up at the door. If that sounds like you, call (361) 470-8872 and you’ll get a live person, not a menu. Tell us what the furnace is doing, and we’ll tell you what it probably costs before we ever roll a truck.

How Lennox Products Fail – and How We Fix Them

Lennox builds a solid furnace, but every brand has its patterns. In San Antonio, where furnaces sit idle for eight months and then fire up hard in late November, we see the same handful of failures year after year. Here’s what actually breaks on a Lennox, and what we do about it.

• Ignitor failure on the Elite and Merit series. Lennox uses a silicon nitride ignitor that’s generally reliable, but San Antonio’s dry air combined with dust from long idle periods can crack or carbon-coat it. The symptom is usually a furnace that hums, the inducer motor spins up, but no flame ever catches. We replace it with an OEM Lennox ignitor when the customer wants factory parts, or a quality aftermarket unit (which often runs $40 – $80 cheaper) when the warranty’s long gone. Devin Marlowe tells customers the truth: on an older furnace, aftermarket is often the smarter money.
• Pressure switch trips on the SLP98V and G61 series. These are high-efficiency units with sealed combustion, and the pressure switch is finicky about airflow. A partially blocked vent, a cracked collector box gasket, or even a wasp nest in the exhaust pipe from the off-season will trip it. We check the venting first – we’ve pulled enough San Antonio wasp nests out of Lennox flue pipes to spot that problem in about ninety seconds. The fix is usually cleaning the port or replacing the gasket, not replacing the switch itself.
• Heat exchanger rust-through on older G26 and G32 models. These units are twenty-plus years old now, and San Antonio’s winter humidity swings take a toll on the thin-gauge steel Lennox used back then. If we see rust trails, cracks, or flame rollout at the burner box, we shut the unit down and tell you straight: this one’s done. A cracked heat exchanger isn’t a repair, it’s a carbon monoxide risk, and we won’t patch it. We’ll quote you a replacement with the written price before any work, and we’ll help you decide if repair money is better spent on new equipment.
• Inducer motor bearing noise on the ML193 and EL195 series. These entry-level and mid-tier Lennox lines use a single-speed inducer that tends to get noisy before it dies. Homeowners describe it as a grinding or rattling sound from the cabinet when the furnace kicks on. The fix is an inducer motor assembly replacement – usually a two-hour job including testing. We carry aftermarket direct-fit replacements for most common Lennox inducer models because the OEM unit for these series is often backordered for weeks, and nobody in San Antonio wants to wait through a cold snap.
• Control board failure after power surges on the SLP99V and EL296V. San Antonio thunderstorms and the grid flickers that come with them are hard on variable-speed Lennox boards. These aren’t cheap parts – the boards on communicating Lennox systems can run $300 – $600 by themselves. Before we condemn a board, we verify the thermostat wiring, the transformer, and the fuse, because on Lennox communicating systems, a failed low-voltage connection can present exactly like a dead board. We’ve saved customers real money by finding the $15 fix instead of the $500 one.

Our Lennox Furnace Repair Process

Here’s what a Lennox repair looks like when you call Brandt HVAC Co San Antonio. No surprises, no mystery techs, no work you didn’t agree to in writing.

1. 1
   You call, a person answers. That’s not a slogan. We staff phones with live people 24/7, nights, weekends, holidays. You describe the problem. We give you a straight answer on likely cost range before we schedule.
2. 2
   You get the technician’s name and photo before arrival. This is the Threshold Verified standard. You know exactly who’s coming, what they look like, and that they’ve been background-checked and identity-verified. When they knock, they show a photo ID badge. If someone shows up who you weren’t told to expect, that visit is on us.
3. 3
   Diagnosis on site. The tech runs through the Lennox furnace systematically – thermostat signal, inducer, ignitor, flame sensor, gas valve, pressure switches, blower motor, and heat exchanger when the symptom warrants. They explain what they find in plain terms, because Devin figures a homeowner who understands what broke is a homeowner who trusts the fix.
4. 4
   Written price before any work. Always. No exceptions. You see the number, you agree to the number, and only then does anything come apart. Parts are priced honestly – we tell you whether OEM Lennox or a quality aftermarket part makes more sense for your unit’s age and warranty status.
5. 5
   The repair and the test. We fix the part, cycle the furnace through a full start, verify flame signal, check temperature rise across the heat exchanger, and watch for error codes. We don’t leave until the unit runs cleanly through at least three cycles.
6. 6
   Written guarantee, no fine print. Every repair includes a written guarantee. If it fails within the guarantee period, the second visit is free – no argument, no additional charge. That’s the 365-Day Done Right Promise, and it’s been how we work since 2003.

What Lennox Furnace Repair Costs in San Antonio

Most Lennox furnace repairs in San Antonio land between $150 and $700, parts and labor included. Here’s how that breaks down by the jobs we see most often:

What moves the price: the specific Lennox model (communicating systems cost more to diagnose and part), whether you’re in warranty or out, and whether OEM or aftermarket parts fit the unit’s age. Every quote is a written fixed price before work starts. Call (361) 470-8872 and tell us what your Lennox is doing – we’ll give you a straight price range before you even book.

Why San Antonio Homeowners Call Brandt HVAC Co San Antonio for Lennox Work

Plenty of HVAC companies in San Antonio will claim they can fix a Lennox. We’d rather prove it. Our techs see Lennox units every week – Elite, Merit, Dave Lennox Signature Collection – and they know the difference between a G61 and an EL296V without looking at the data plate twice. But the bigger reason homeowners call us is this: we tell you exactly who’s walking through your door before they arrive. A named, photo-verified, background-checked technician with a badge. A written price before anything comes apart. A written guarantee that means what it says, backed by the 365-Day Done Right Promise. If your Lennox is down and you also service Carrier or Trane, that doesn’t stop us – we repair those too. But when a Lennox won’t fire on a cold San Antonio morning, call a company that treats your front door and your furnace with the same seriousness. Call (361) 470-8872.

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