Lennox Furnace Repair Nationwide

Lennox Furnace Repair in Houston: What to Know First

Lennox furnace repair in Houston typically runs $150 – $700 depending on what failed, and most jobs are completed in one visit. Cold Harbour Heating and Air Houston is an independent Lennox service provider, which means we fix your furnace without pushing you toward a replacement you don’t need. Victor Mancini, our owner and lead technician, learned this trade the hard way: diagnosing the actual problem before anyone quotes a price. If your Lennox furnace is blowing cold air, short-cycling, or making noise it shouldn’t, call us at (832) 371-9862. We’ll answer the phone, ask what the system is doing, and put a written price in your hands before any work starts.

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How Lennox Products Fail – and How We Fix Them

• The SLP98V pressure switch trips during Houston’s damp winter days. We see this constantly in the SLP98V variable-speed series. Houston’s humidity means the condensate drain line grows algae faster than the system can clear it, which backs up and tricks the pressure switch into shutting the furnace down. The fix is usually a drain line flush and a pressure switch verification – not a new switch. A lot of companies replace the switch first and the furnace still won’t run. We test before we spend your money.
• The EL296V ignitor fails after three to five Houston heating seasons. The EL296V is a workhorse, but its silicon nitride ignitor has a known fatigue point. When it cracks, you get a furnace that cycles on, then shuts off before the burners light. A replacement ignitor on a Lennox EL296V here runs $150 – $280 parts and labor. We use OEM ignitors on Lennox warranties and quality aftermarket only when you’re out of warranty and want to save money. Either way, we show you the cracked ignitor before we install the new one.
• The ML180 gas valve sticks after months of sitting idle. Houston furnaces spend most of the year off. That’s hard on gas valves, especially in the entry-level ML180 line. The valve’s internal diaphragm dries out, and when the first cold snap hits, the furnace either won’t fire or fires intermittently. We clean and test the valve first; if it’s truly failed, a replacement typically runs $220 – $450 installed. What we won’t do is sell you a valve because “it’s probably bad.” We show you the test result.
• The SLP98V’s variable-speed blower motor develops bearing noise that sounds like a failing heat exchanger. This one scares homeowners, and for good reason. A rumble from the cabinet can mean a cracked heat exchanger – or it can mean the blower motor’s bearings are worn. On the SLP98V, we check the motor first because it’s far more common than a heat exchanger failure in a furnace that’s under ten years old. A blower motor replacement runs $300 – $650 depending on whether it’s the ECM module or the motor itself that failed.
• Thermostat compatibility issues on older Lennox Signature series units. If you have an older Lennox Signature furnace paired with a non-communicating thermostat, you lose the variable-speed efficiency you paid for, and sometimes you get short-cycling that mimics a limit switch failure. We see this in homes where a previous contractor swapped in a generic thermostat. The fix is a thermostat that matches your furnace’s communicating protocol – a $200 – $350 job that often solves three symptoms at once.

Our Lennox Furnace Repair Process

Here’s what actually happens when you call us for Lennox furnace repair in Houston:

1. 1
   You call (832) 371-9862, a live person answers. No voicemail, no menu. You tell us what the furnace is doing and we schedule a firm arrival window that same day or the next.
2. 2
   Your technician arrives, introduces himself, and asks one question. “Tell me what the system is doing – and I’ll tell you exactly what it needs.” That’s Victor’s signature line, but every tech on our team follows the same diagnostic-first approach.
3. 3
   We open the furnace and test, not guess. On a Lennox, we check the ignitor, flame sensor, gas valve, pressure switch, and board in that order – because that’s the failure order we see in Houston. We show you any part we recommend replacing and explain why it failed.
4. 4
   You get a written price before we touch a tool. Parts and labor, one number, no surprise at the door. If you decide to proceed, we do the work the same visit.
5. 5
   We test the full sequence. Burner ignition, flame stability, blower ramp-up, limit switch operation, thermostat communication. Every Lennox repair gets a complete cycle test, not just a “it turns on now.”
6. 6
   You get a written 365-Day Done Right Promise before we leave. If the repair fails within a full year, we come back and make it right at no charge. Written down, not verbal.

What Lennox Furnace Repair Costs in Houston

Here’s what you can expect to pay for common Lennox furnace repairs in the Houston market:

• Ignitor replacement: $150 – $280 parts and labor
• Flame sensor cleaning or replacement: $100 – $200
• Gas valve replacement: $220 – $450
• Pressure switch replacement: $150 – $300
• Blower motor replacement (ECM): $350 – $650
• Control board replacement: $250 – $550

What moves the price? The specific Lennox model you own, whether we use OEM or aftermarket parts, and how accessible your furnace is. An SLP98V in a tight attic closet costs more to service than an ML180 in an open garage. We’ll give you a written price before any work begins, and that price does not change at the door. Call (832) 371-9862 for an exact quote – estimates are free.

Why Houston Homeowners Call Cold Harbour Heating and Air Houston for Lennox Work

We’re independently owned and operated, part of the Kingswell network of HVAC businesses held to the same written standards. That means every Lennox repair carries the 365-Day Done Right Promise in writing – if it fails within a year, we return and fix it at no charge. No argument, no conditions, no fine print. Our technicians are background-checked, uniformed, and trained to service nine major HVAC brands including Lennox, Carrier, and Trane, so if your furnace repair uncovers a problem with the other system in your home, we can address it the same day. And when you call us at any hour, a live person answers – not a machine. The name Cold Harbour comes from the roadside shelter where travelers waited out the weather. We think of comfort the same way: shelter you can count on, in any season.

Frequently Asked Questions About Lennox Furnace Repair in Houston