Lennox Furnace Repair Nationwide

Lennox Furnace Repair in San Antonio: What to Know First

We’re Halden Heating and Air San Antonio, and we repair Lennox furnaces across the greater San Antonio area as an independent Lennox service provider. Most Lennox furnace repairs here run between $150 and $700 depending on the part that failed, and we can typically get a technician to your door the same day you call. Before anyone opens a toolbox, you get a written price. That’s not a courtesy. That’s how we work.

Call (903) 623-6784

This page is for Lennox owners in San Antonio who want straight answers about what’s wrong with their furnace, what it’ll cost to fix, and whether the repair is worth doing. If your Lennox is blowing cold air, short cycling, or just refusing to kick on, call us at (903) 623-6784 and a live person picks up. No phone tree, no callback list.

How Lennox Products Fail – and How We Fix Them

Lennox builds solid equipment, but every brand has patterns. After years of working on Lennox furnaces in San Antonio homes, here are the failure modes we see most and what we do about them.

• Ignitor failures on the Elite series (EL296, EL280). The silicon nitride ignitor on these units gets brittle with age and repeated heat cycling. The symptom is usually a furnace that hums, runs the draft inducer, but never lights. We replace it with an OEM-spec ignitor, not a universal one, because universal ignitors often sit at the wrong angle on Lennox burners and cause delayed ignition.
• Pressure switch faults on the SLP98 and ML193. San Antonio’s humidity plus dust from construction and live oaks means pressure switch tubing clogs faster than the manufacturer assumes. The furnace locks out with a pressure switch error code, and a lot of companies replace the switch itself when the real problem is a blocked tube or a failing draft inducer not pulling enough vacuum. We test the switch with a manometer before swapping parts.
• Heat exchanger cracking on 15+ year old G50 and G60 models. These older Lennox mid-efficiency units run hot, and thermal expansion takes its toll on the crimped seams. We find cracked heat exchangers most often on furnaces that were oversized for the home. We check with a combustion analyzer and a physical inspection camera before condemning anything.
• Blower motor failure on variable-speed models like the EL296V. The ECM blower motors Lennox uses are efficient but sensitive to voltage fluctuations and dust buildup. When they fail, the furnace lights but can’t move air, so it trips a limit switch and shuts down. We confirm the motor is getting correct voltage before replacing it, because sometimes the control board is the culprit.
• Gas valve issues on the ML180 and EL195. These units use a two-stage gas valve that can get stuck in low fire, which makes the furnace run constantly but never heat the house properly. The fix is recalibration or replacement, and we always verify gas pressure after the job with a manometer, not just a visual check.

Our Lennox Furnace Repair Process

When you call Halden Heating and Air San Antonio for Lennox furnace repair, here’s the sequence, start to finish.

1. 1
   Call or book online. A live person answers. We schedule the visit and send a live arrival time you can track to your door. No four-hour window.
2. 2
   Diagnostics. Your technician walks the system with a combustion analyzer, manometer, and multimeter. We test the sequence of operation component by component until we find the fault. Lennox control boards flash diagnostic codes, but we verify the code, not just trust it.
3. 3
   Written price. Before any work begins, you get a line-item written price. That price includes parts, labor, and any required seals or gaskets. You approve it, then we start.
4. 4
   The repair. We use OEM Lennox parts where warranty or performance matters, and quality aftermarket parts where they’re equally reliable and meaningfully cheaper. You’ll know which one before we buy it.
5. 5
   Testing. After the repair, we run the furnace through at least three full heating cycles and re-check gas pressure, temperature rise, and carbon monoxide output.
6. 6
   Cleanup and guarantee. We leave the area cleaner than we found it and email you a written guarantee on the repair. If it fails within the coverage window, the second visit is free. No arguing required.

What Lennox Furnace Repair Costs in San Antonio

Most Lennox furnace repairs in San Antonio land between $150 and $700. The spread comes down to the part.

• Ignitor replacement: $150 – $300, typically same visit
• Pressure switch replacement: $180 – $350
• Gas valve replacement: $300 – $550
• Blower motor replacement: $350 – $700 depending on fixed-speed versus variable-speed ECM
• Heat exchanger replacement: $600 – $700 on models where it’s still worth doing; on a unit past 15 years, we’ll tell you honestly if replacement makes more sense

What moves the price is the part itself and how deep the repair goes. An ignitor takes 20 minutes. A blower motor takes an hour and the motor costs more. You’ll know the number before we start. Call (903) 623-6784 and we’ll give you a straight answer.

Why San Antonio Homeowners Call Halden Heating and Air San Antonio for Lennox Work

Andre Fuller started Halden Heating and Air on a simple rule: tell the customer the price before anyone opens a toolbox. After more than 25 years in HVAC, including training at Los Angeles Trade-Technical College and plenty of service calls near the Pearl District where older San Antonio buildings test every system, Andre and our crew have seen just about everything a Lennox can do. We’re also a multi-brand shop. If your Lennox needs a part that’s backordered and you’re looking at a cold night, we service Carrier and Trane too, and we can tell you honestly if a cross-compatible part will work. Every repair comes with a written guarantee and a free return visit if it fails. Straight answer, written price, no runaround.

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